chore: checkpoint before Python removal

vendor/time-macros/src/date.rs

@@ -0,0 +1,162 @@
+use std::iter::Peekable;
+
+use num_conv::Truncate;
+use proc_macro::token_stream;
+use time_core::util::{days_in_year, weeks_in_year};
+
+use crate::Error;
+use crate::helpers::{consume_number, consume_punct, days_in_year_month, ymd_to_yo, ywd_to_yo};
+use crate::to_tokens::ToTokenStream;
+
+#[cfg(feature = "large-dates")]
+const MAX_YEAR: i32 = 999_999;
+#[cfg(not(feature = "large-dates"))]
+const MAX_YEAR: i32 = 9_999;
+
+pub(crate) struct Date {
+    pub(crate) year: i32,
+    pub(crate) ordinal: u16,
+}
+
+pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<Date, Error> {
+    let (year_sign_span, year_sign, explicit_sign) = if let Ok(span) = consume_punct('-', chars) {
+        (Some(span), -1, true)
+    } else if let Ok(span) = consume_punct('+', chars) {
+        (Some(span), 1, true)
+    } else {
+        (None, 1, false)
+    };
+    let (year_span, mut year) = consume_number::<i32>("year", chars)?;
+    year *= year_sign;
+    if year.abs() > MAX_YEAR {
+        return Err(Error::InvalidComponent {
+            name: "year",
+            value: year.to_string(),
+            span_start: Some(year_sign_span.unwrap_or_else(|| year_span.start())),
+            span_end: Some(year_span.end()),
+        });
+    }
+    if !explicit_sign && year.abs() >= 10_000 {
+        return Err(Error::Custom {
+            message: "years with more than four digits must have an explicit sign".into(),
+            span_start: Some(year_sign_span.unwrap_or_else(|| year_span.start())),
+            span_end: Some(year_span.end()),
+        });
+    }
+
+    consume_punct('-', chars)?;
+
+    // year-week-day
+    if let Some(proc_macro::TokenTree::Ident(ident)) = chars.peek()
+        && let s = ident.to_string()
+        && s.starts_with('W')
+    {
+        let w_span = ident.span();
+        drop(chars.next()); // consume 'W' and possibly the week number
+
+        let (week_span, week, day_span, day);
+
+        if s.len() == 1 {
+            (week_span, week) = consume_number::<u8>("week", chars)?;
+            consume_punct('-', chars)?;
+            (day_span, day) = consume_number::<u8>("day", chars)?;
+        } else {
+            let presumptive_week = &s[1..];
+            if presumptive_week.bytes().all(|d| d.is_ascii_digit())
+                && let Ok(week_number) = presumptive_week.replace('_', "").parse()
+            {
+                (week_span, week) = (w_span, week_number);
+                consume_punct('-', chars)?;
+                (day_span, day) = consume_number::<u8>("day", chars)?;
+            } else {
+                return Err(Error::InvalidComponent {
+                    name: "week",
+                    value: presumptive_week.to_string(),
+                    span_start: Some(w_span.start()),
+                    span_end: Some(w_span.end()),
+                });
+            }
+        };
+
+        if week > weeks_in_year(year) {
+            return Err(Error::InvalidComponent {
+                name: "week",
+                value: week.to_string(),
+                span_start: Some(w_span.start()),
+                span_end: Some(week_span.end()),
+            });
+        }
+        if day == 0 || day > 7 {
+            return Err(Error::InvalidComponent {
+                name: "day",
+                value: day.to_string(),
+                span_start: Some(day_span.start()),
+                span_end: Some(day_span.end()),
+            });
+        }
+
+        let (year, ordinal) = ywd_to_yo(year, week, day);
+
+        return Ok(Date { year, ordinal });
+    }
+
+    // We don't yet know whether it's year-month-day or year-ordinal.
+    let (month_or_ordinal_span, month_or_ordinal) =
+        consume_number::<u16>("month or ordinal", chars)?;
+
+    // year-month-day
+    if consume_punct('-', chars).is_ok() {
+        let (month_span, month) = (month_or_ordinal_span, month_or_ordinal);
+        let (day_span, day) = consume_number::<u8>("day", chars)?;
+
+        if month == 0 || month > 12 {
+            return Err(Error::InvalidComponent {
+                name: "month",
+                value: month.to_string(),
+                span_start: Some(month_span.start()),
+                span_end: Some(month_span.end()),
+            });
+        }
+        let month = month.truncate();
+        if day == 0 || day > days_in_year_month(year, month) {
+            return Err(Error::InvalidComponent {
+                name: "day",
+                value: day.to_string(),
+                span_start: Some(day_span.start()),
+                span_end: Some(day_span.end()),
+            });
+        }
+
+        let (year, ordinal) = ymd_to_yo(year, month, day);
+
+        Ok(Date { year, ordinal })
+    }
+    // year-ordinal
+    else {
+        let (ordinal_span, ordinal) = (month_or_ordinal_span, month_or_ordinal);
+
+        if ordinal == 0 || ordinal > days_in_year(year) {
+            return Err(Error::InvalidComponent {
+                name: "ordinal",
+                value: ordinal.to_string(),
+                span_start: Some(ordinal_span.start()),
+                span_end: Some(ordinal_span.end()),
+            });
+        }
+
+        Ok(Date { year, ordinal })
+    }
+}
+
+impl ToTokenStream for Date {
+    fn append_to(self, ts: &mut proc_macro::TokenStream) {
+        quote_append! { ts
+            unsafe {
+                ::time::Date::__from_ordinal_date_unchecked(
+                    #(self.year),
+                    #(self.ordinal),
+                )
+            }
+        }
+    }
+}

vendor/time-macros/src/datetime.rs

@@ -0,0 +1,50 @@
+use std::iter::Peekable;
+
+use proc_macro::{TokenStream, token_stream};
+
+use crate::date::Date;
+use crate::error::Error;
+use crate::offset::Offset;
+use crate::time::Time;
+use crate::to_tokens::ToTokenStream;
+use crate::{date, offset, time};
+
+pub(crate) struct DateTime {
+    date: Date,
+    time: Time,
+    offset: Option<Offset>,
+}
+
+pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<DateTime, Error> {
+    let date = date::parse(chars)?;
+    let time = time::parse(chars)?;
+    let offset = match offset::parse(chars) {
+        Ok(offset) => Some(offset),
+        Err(Error::UnexpectedEndOfInput | Error::MissingComponent { name: "sign", .. }) => None,
+        Err(err) => return Err(err),
+    };
+
+    if let Some(token) = chars.peek() {
+        return Err(Error::UnexpectedToken {
+            tree: token.clone(),
+        });
+    }
+
+    Ok(DateTime { date, time, offset })
+}
+
+impl ToTokenStream for DateTime {
+    fn append_to(self, ts: &mut TokenStream) {
+        let maybe_offset = match self.offset {
+            Some(offset) => quote_! { .assume_offset(#S(offset)) },
+            None => quote_! {},
+        };
+
+        quote_append! { ts
+            ::time::PrimitiveDateTime::new(
+                #S(self.date),
+                #S(self.time),
+            ) #S(maybe_offset)
+        }
+    }
+}

vendor/time-macros/src/error.rs

@@ -0,0 +1,123 @@
+use std::borrow::Cow;
+use std::fmt;
+
+use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+
+trait WithSpan {
+    fn with_span(self, span: Span) -> Self;
+}
+
+impl WithSpan for TokenTree {
+    fn with_span(mut self, span: Span) -> Self {
+        self.set_span(span);
+        self
+    }
+}
+
+pub(crate) enum Error {
+    MissingComponent {
+        name: &'static str,
+        span_start: Option<Span>,
+        span_end: Option<Span>,
+    },
+    InvalidComponent {
+        name: &'static str,
+        value: String,
+        span_start: Option<Span>,
+        span_end: Option<Span>,
+    },
+    #[cfg(any(feature = "formatting", feature = "parsing"))]
+    ExpectedString {
+        span_start: Option<Span>,
+        span_end: Option<Span>,
+    },
+    UnexpectedToken {
+        tree: TokenTree,
+    },
+    UnexpectedEndOfInput,
+    Custom {
+        message: Cow<'static, str>,
+        span_start: Option<Span>,
+        span_end: Option<Span>,
+    },
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::MissingComponent { name, .. } => write!(f, "missing component: {name}"),
+            Self::InvalidComponent { name, value, .. } => {
+                write!(f, "invalid component: {name} was {value}")
+            }
+            #[cfg(any(feature = "formatting", feature = "parsing"))]
+            Self::ExpectedString { .. } => f.write_str("expected string literal"),
+            Self::UnexpectedToken { tree } => write!(f, "unexpected token: {tree}"),
+            Self::UnexpectedEndOfInput => f.write_str("unexpected end of input"),
+            Self::Custom { message, .. } => f.write_str(message),
+        }
+    }
+}
+
+impl Error {
+    fn span_start(&self) -> Span {
+        match self {
+            Self::MissingComponent { span_start, .. }
+            | Self::InvalidComponent { span_start, .. }
+            | Self::Custom { span_start, .. } => *span_start,
+            #[cfg(any(feature = "formatting", feature = "parsing"))]
+            Self::ExpectedString { span_start, .. } => *span_start,
+            Self::UnexpectedToken { tree } => Some(tree.span()),
+            Self::UnexpectedEndOfInput => Some(Span::mixed_site()),
+        }
+        .unwrap_or_else(Span::mixed_site)
+    }
+
+    fn span_end(&self) -> Span {
+        match self {
+            Self::MissingComponent { span_end, .. }
+            | Self::InvalidComponent { span_end, .. }
+            | Self::Custom { span_end, .. } => *span_end,
+            #[cfg(any(feature = "formatting", feature = "parsing"))]
+            Self::ExpectedString { span_end, .. } => *span_end,
+            Self::UnexpectedToken { tree, .. } => Some(tree.span()),
+            Self::UnexpectedEndOfInput => Some(Span::mixed_site()),
+        }
+        .unwrap_or_else(|| self.span_start())
+    }
+
+    pub(crate) fn to_compile_error(&self) -> TokenStream {
+        let (start, end) = (self.span_start(), self.span_end());
+
+        [
+            TokenTree::from(Punct::new(':', Spacing::Joint)).with_span(start),
+            TokenTree::from(Punct::new(':', Spacing::Alone)).with_span(start),
+            TokenTree::from(Ident::new("core", start)),
+            TokenTree::from(Punct::new(':', Spacing::Joint)).with_span(start),
+            TokenTree::from(Punct::new(':', Spacing::Alone)).with_span(start),
+            TokenTree::from(Ident::new("compile_error", start)),
+            TokenTree::from(Punct::new('!', Spacing::Alone)).with_span(start),
+            TokenTree::from(Group::new(
+                Delimiter::Parenthesis,
+                TokenStream::from(
+                    TokenTree::from(Literal::string(&self.to_string())).with_span(end),
+                ),
+            ))
+            .with_span(end),
+        ]
+        .iter()
+        .cloned()
+        .collect()
+    }
+
+    /// Like `to_compile_error`, but for use in macros that produce items.
+    #[cfg(all(feature = "serde", any(feature = "formatting", feature = "parsing")))]
+    pub(crate) fn to_compile_error_standalone(&self) -> TokenStream {
+        let end = self.span_end();
+        self.to_compile_error()
+            .into_iter()
+            .chain(std::iter::once(
+                TokenTree::from(Punct::new(';', Spacing::Alone)).with_span(end),
+            ))
+            .collect()
+    }
+}

vendor/time-macros/src/format_description/ast.rs

@@ -0,0 +1,252 @@
+use std::iter;
+
+use super::{Error, Location, Spanned, SpannedValue, Unused, lexer, unused};
+
+pub(super) enum Item<'a> {
+    Literal(Spanned<&'a [u8]>),
+    EscapedBracket {
+        _first: Unused<Location>,
+        _second: Unused<Location>,
+    },
+    Component {
+        _opening_bracket: Unused<Location>,
+        _leading_whitespace: Unused<Option<Spanned<&'a [u8]>>>,
+        name: Spanned<&'a [u8]>,
+        modifiers: Box<[Modifier<'a>]>,
+        _trailing_whitespace: Unused<Option<Spanned<&'a [u8]>>>,
+        _closing_bracket: Unused<Location>,
+    },
+    Optional {
+        opening_bracket: Location,
+        _leading_whitespace: Unused<Option<Spanned<&'a [u8]>>>,
+        _optional_kw: Unused<Spanned<&'a [u8]>>,
+        _whitespace: Unused<Spanned<&'a [u8]>>,
+        nested_format_description: NestedFormatDescription<'a>,
+        closing_bracket: Location,
+    },
+    First {
+        opening_bracket: Location,
+        _leading_whitespace: Unused<Option<Spanned<&'a [u8]>>>,
+        _first_kw: Unused<Spanned<&'a [u8]>>,
+        _whitespace: Unused<Spanned<&'a [u8]>>,
+        nested_format_descriptions: Box<[NestedFormatDescription<'a>]>,
+        closing_bracket: Location,
+    },
+}
+
+pub(super) struct NestedFormatDescription<'a> {
+    pub(super) _opening_bracket: Unused<Location>,
+    pub(super) items: Box<[Item<'a>]>,
+    pub(super) _closing_bracket: Unused<Location>,
+    pub(super) _trailing_whitespace: Unused<Option<Spanned<&'a [u8]>>>,
+}
+
+pub(super) struct Modifier<'a> {
+    pub(super) _leading_whitespace: Unused<Spanned<&'a [u8]>>,
+    pub(super) key: Spanned<&'a [u8]>,
+    pub(super) _colon: Unused<Location>,
+    pub(super) value: Spanned<&'a [u8]>,
+}
+
+pub(super) fn parse<
+    'item: 'iter,
+    'iter,
+    I: Iterator<Item = Result<lexer::Token<'item>, Error>>,
+    const VERSION: u8,
+>(
+    tokens: &'iter mut lexer::Lexed<I>,
+) -> impl Iterator<Item = Result<Item<'item>, Error>> + use<'item, 'iter, I, VERSION> {
+    assert!(version!(1..=2));
+    parse_inner::<_, false, VERSION>(tokens)
+}
+
+fn parse_inner<
+    'item,
+    I: Iterator<Item = Result<lexer::Token<'item>, Error>>,
+    const NESTED: bool,
+    const VERSION: u8,
+>(
+    tokens: &mut lexer::Lexed<I>,
+) -> impl Iterator<Item = Result<Item<'item>, Error>> + use<'_, 'item, I, NESTED, VERSION> {
+    iter::from_fn(move || {
+        if NESTED && tokens.peek_closing_bracket().is_some() {
+            return None;
+        }
+
+        let next = match tokens.next()? {
+            Ok(token) => token,
+            Err(err) => return Some(Err(err)),
+        };
+
+        Some(match next {
+            lexer::Token::Literal(Spanned { value: _, span: _ }) if NESTED => {
+                bug!("literal should not be present in nested description")
+            }
+            lexer::Token::Literal(value) => Ok(Item::Literal(value)),
+            lexer::Token::Bracket {
+                kind: lexer::BracketKind::Opening,
+                location,
+            } => {
+                if version!(..=1) {
+                    if let Some(second_location) = tokens.next_if_opening_bracket() {
+                        Ok(Item::EscapedBracket {
+                            _first: unused(location),
+                            _second: unused(second_location),
+                        })
+                    } else {
+                        parse_component::<_, VERSION>(location, tokens)
+                    }
+                } else {
+                    parse_component::<_, VERSION>(location, tokens)
+                }
+            }
+            lexer::Token::Bracket {
+                kind: lexer::BracketKind::Closing,
+                location: _,
+            } if NESTED => {
+                bug!("closing bracket should be caught by the `if` statement")
+            }
+            lexer::Token::Bracket {
+                kind: lexer::BracketKind::Closing,
+                location: _,
+            } => {
+                bug!("closing bracket should have been consumed by `parse_component`")
+            }
+            lexer::Token::ComponentPart { kind: _, value } if NESTED => Ok(Item::Literal(value)),
+            lexer::Token::ComponentPart { kind: _, value: _ } => {
+                bug!("component part should have been consumed by `parse_component`")
+            }
+        })
+    })
+}
+
+fn parse_component<'a, I: Iterator<Item = Result<lexer::Token<'a>, Error>>, const VERSION: u8>(
+    opening_bracket: Location,
+    tokens: &mut lexer::Lexed<I>,
+) -> Result<Item<'a>, Error> {
+    let leading_whitespace = tokens.next_if_whitespace();
+
+    let Some(name) = tokens.next_if_not_whitespace() else {
+        let span = match leading_whitespace {
+            Some(Spanned { value: _, span }) => span,
+            None => opening_bracket.to(opening_bracket),
+        };
+        return Err(span.error("expected component name"));
+    };
+
+    if *name == b"optional" {
+        let Some(whitespace) = tokens.next_if_whitespace() else {
+            return Err(name.span.error("expected whitespace after `optional`"));
+        };
+
+        let nested = parse_nested::<_, VERSION>(whitespace.span.end, tokens)?;
+
+        let Some(closing_bracket) = tokens.next_if_closing_bracket() else {
+            return Err(opening_bracket.error("unclosed bracket"));
+        };
+
+        return Ok(Item::Optional {
+            opening_bracket,
+            _leading_whitespace: unused(leading_whitespace),
+            _optional_kw: unused(name),
+            _whitespace: unused(whitespace),
+            nested_format_description: nested,
+            closing_bracket,
+        });
+    }
+
+    if *name == b"first" {
+        let Some(whitespace) = tokens.next_if_whitespace() else {
+            return Err(name.span.error("expected whitespace after `first`"));
+        };
+
+        let mut nested_format_descriptions = Vec::new();
+        while let Ok(description) = parse_nested::<_, VERSION>(whitespace.span.end, tokens) {
+            nested_format_descriptions.push(description);
+        }
+
+        let Some(closing_bracket) = tokens.next_if_closing_bracket() else {
+            return Err(opening_bracket.error("unclosed bracket"));
+        };
+
+        return Ok(Item::First {
+            opening_bracket,
+            _leading_whitespace: unused(leading_whitespace),
+            _first_kw: unused(name),
+            _whitespace: unused(whitespace),
+            nested_format_descriptions: nested_format_descriptions.into_boxed_slice(),
+            closing_bracket,
+        });
+    }
+
+    let mut modifiers = Vec::new();
+    let trailing_whitespace = loop {
+        let Some(whitespace) = tokens.next_if_whitespace() else {
+            break None;
+        };
+
+        if let Some(location) = tokens.next_if_opening_bracket() {
+            return Err(location
+                .to(location)
+                .error("modifier must be of the form `key:value`"));
+        }
+
+        let Some(Spanned { value, span }) = tokens.next_if_not_whitespace() else {
+            break Some(whitespace);
+        };
+
+        let Some(colon_index) = value.iter().position(|&b| b == b':') else {
+            return Err(span.error("modifier must be of the form `key:value`"));
+        };
+        let key = &value[..colon_index];
+        let value = &value[colon_index + 1..];
+
+        if key.is_empty() {
+            return Err(span.shrink_to_start().error("expected modifier key"));
+        }
+        if value.is_empty() {
+            return Err(span.shrink_to_end().error("expected modifier value"));
+        }
+
+        modifiers.push(Modifier {
+            _leading_whitespace: unused(whitespace),
+            key: key.spanned(span.shrink_to_before(colon_index as u32)),
+            _colon: unused(span.start.offset(colon_index as u32)),
+            value: value.spanned(span.shrink_to_after(colon_index as u32)),
+        });
+    };
+
+    let Some(closing_bracket) = tokens.next_if_closing_bracket() else {
+        return Err(opening_bracket.error("unclosed bracket"));
+    };
+
+    Ok(Item::Component {
+        _opening_bracket: unused(opening_bracket),
+        _leading_whitespace: unused(leading_whitespace),
+        name,
+        modifiers: modifiers.into_boxed_slice(),
+        _trailing_whitespace: unused(trailing_whitespace),
+        _closing_bracket: unused(closing_bracket),
+    })
+}
+
+fn parse_nested<'a, I: Iterator<Item = Result<lexer::Token<'a>, Error>>, const VERSION: u8>(
+    last_location: Location,
+    tokens: &mut lexer::Lexed<I>,
+) -> Result<NestedFormatDescription<'a>, Error> {
+    let Some(opening_bracket) = tokens.next_if_opening_bracket() else {
+        return Err(last_location.error("expected opening bracket"));
+    };
+    let items = parse_inner::<_, true, VERSION>(tokens).collect::<Result<_, _>>()?;
+    let Some(closing_bracket) = tokens.next_if_closing_bracket() else {
+        return Err(opening_bracket.error("unclosed bracket"));
+    };
+    let trailing_whitespace = tokens.next_if_whitespace();
+
+    Ok(NestedFormatDescription {
+        _opening_bracket: unused(opening_bracket),
+        items,
+        _closing_bracket: unused(closing_bracket),
+        _trailing_whitespace: unused(trailing_whitespace),
+    })
+}

vendor/time-macros/src/format_description/format_item.rs

@@ -0,0 +1,454 @@
+use std::num::NonZero;
+use std::str::{self, FromStr};
+
+use super::{Error, Span, Spanned, Unused, ast, unused};
+
+pub(super) fn parse<'a>(
+    ast_items: impl Iterator<Item = Result<ast::Item<'a>, Error>>,
+) -> impl Iterator<Item = Result<Item<'a>, Error>> {
+    ast_items.map(|ast_item| ast_item.and_then(Item::from_ast))
+}
+
+pub(super) enum Item<'a> {
+    Literal(&'a [u8]),
+    Component(Component),
+    Optional {
+        value: Box<[Self]>,
+        _span: Unused<Span>,
+    },
+    First {
+        value: Box<[Box<[Self]>]>,
+        _span: Unused<Span>,
+    },
+}
+
+impl Item<'_> {
+    pub(super) fn from_ast(ast_item: ast::Item<'_>) -> Result<Item<'_>, Error> {
+        Ok(match ast_item {
+            ast::Item::Component {
+                _opening_bracket: _,
+                _leading_whitespace: _,
+                name,
+                modifiers,
+                _trailing_whitespace: _,
+                _closing_bracket: _,
+            } => Item::Component(component_from_ast(&name, &modifiers)?),
+            ast::Item::Literal(Spanned { value, span: _ }) => Item::Literal(value),
+            ast::Item::EscapedBracket {
+                _first: _,
+                _second: _,
+            } => Item::Literal(b"["),
+            ast::Item::Optional {
+                opening_bracket,
+                _leading_whitespace: _,
+                _optional_kw: _,
+                _whitespace: _,
+                nested_format_description,
+                closing_bracket,
+            } => {
+                let items = nested_format_description
+                    .items
+                    .into_vec()
+                    .into_iter()
+                    .map(Item::from_ast)
+                    .collect::<Result<_, _>>()?;
+                Item::Optional {
+                    value: items,
+                    _span: unused(opening_bracket.to(closing_bracket)),
+                }
+            }
+            ast::Item::First {
+                opening_bracket,
+                _leading_whitespace: _,
+                _first_kw: _,
+                _whitespace: _,
+                nested_format_descriptions,
+                closing_bracket,
+            } => {
+                let items = nested_format_descriptions
+                    .into_vec()
+                    .into_iter()
+                    .map(|nested_format_description| {
+                        nested_format_description
+                            .items
+                            .into_vec()
+                            .into_iter()
+                            .map(Item::from_ast)
+                            .collect()
+                    })
+                    .collect::<Result<_, _>>()?;
+                Item::First {
+                    value: items,
+                    _span: unused(opening_bracket.to(closing_bracket)),
+                }
+            }
+        })
+    }
+}
+
+impl From<Item<'_>> for crate::format_description::public::OwnedFormatItem {
+    fn from(item: Item<'_>) -> Self {
+        match item {
+            Item::Literal(literal) => Self::Literal(literal.to_vec().into_boxed_slice()),
+            Item::Component(component) => Self::Component(component.into()),
+            Item::Optional { value, _span: _ } => Self::Optional(Box::new(value.into())),
+            Item::First { value, _span: _ } => {
+                Self::First(value.into_vec().into_iter().map(Into::into).collect())
+            }
+        }
+    }
+}
+
+impl<'a> From<Box<[Item<'a>]>> for crate::format_description::public::OwnedFormatItem {
+    fn from(items: Box<[Item<'a>]>) -> Self {
+        let items = items.into_vec();
+        match <[_; 1]>::try_from(items) {
+            Ok([item]) => item.into(),
+            Err(vec) => Self::Compound(vec.into_iter().map(Into::into).collect()),
+        }
+    }
+}
+
+macro_rules! component_definition {
+    (@if_required required then { $($then:tt)* } $(else { $($else:tt)* })?) => { $($then)* };
+    (@if_required then { $($then:tt)* } $(else { $($else:tt)* })?) => { $($($else)*)? };
+    (@if_from_str from_str then { $($then:tt)* } $(else { $($else:tt)* })?) => { $($then)* };
+    (@if_from_str then { $($then:tt)* } $(else { $($else:tt)* })?) => { $($($else)*)? };
+
+    ($vis:vis enum $name:ident {
+        $($variant:ident = $parse_variant:literal {$(
+            $(#[$required:tt])?
+            $field:ident = $parse_field:literal:
+            Option<$(#[$from_str:tt])? $field_type:ty>
+            => $target_field:ident
+        ),* $(,)?}),* $(,)?
+    }) => {
+        $vis enum $name {
+            $($variant($variant),)*
+        }
+
+        $($vis struct $variant {
+            $($field: Option<$field_type>),*
+        })*
+
+        $(impl $variant {
+            fn with_modifiers(
+                modifiers: &[ast::Modifier<'_>],
+                _component_span: Span,
+            ) -> Result<Self, Error>
+            {
+                #[allow(unused_mut)]
+                let mut this = Self {
+                    $($field: None),*
+                };
+
+                for modifier in modifiers {
+                    $(#[allow(clippy::string_lit_as_bytes)]
+                    if modifier.key.eq_ignore_ascii_case($parse_field.as_bytes()) {
+                        this.$field = component_definition!(@if_from_str $($from_str)?
+                            then {
+                                parse_from_modifier_value::<$field_type>(&modifier.value)?
+                            } else {
+                                <$field_type>::from_modifier_value(&modifier.value)?
+                            });
+                        continue;
+                    })*
+                    return Err(modifier.key.span.error("invalid modifier key"));
+                }
+
+                $(component_definition! { @if_required $($required)? then {
+                    if this.$field.is_none() {
+                        return Err(_component_span.error("missing required modifier"));
+                    }
+                }})*
+
+                Ok(this)
+            }
+        })*
+
+        impl From<$name> for crate::format_description::public::Component {
+            fn from(component: $name) -> Self {
+                match component {$(
+                    $name::$variant($variant { $($field),* }) => {
+                        $crate::format_description::public::Component::$variant(
+                            super::public::modifier::$variant {$(
+                                $target_field: component_definition! { @if_required $($required)?
+                                    then {
+                                        match $field {
+                                            Some(value) => value.into(),
+                                            None => bug!("required modifier was not set"),
+                                        }
+                                    } else {
+                                        $field.unwrap_or_default().into()
+                                    }
+                                }
+                            ),*}
+                        )
+                    }
+                )*}
+            }
+        }
+
+        fn component_from_ast(
+            name: &Spanned<&[u8]>,
+            modifiers: &[ast::Modifier<'_>],
+        ) -> Result<Component, Error> {
+            $(#[allow(clippy::string_lit_as_bytes)]
+            if name.eq_ignore_ascii_case($parse_variant.as_bytes()) {
+                return Ok(Component::$variant($variant::with_modifiers(&modifiers, name.span)?));
+            })*
+            Err(name.span.error("invalid component"))
+        }
+    }
+}
+
+component_definition! {
+    pub(super) enum Component {
+        Day = "day" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        End = "end" {
+            trailing_input = "trailing_input": Option<TrailingInput> => trailing_input,
+        },
+        Hour = "hour" {
+            padding = "padding": Option<Padding> => padding,
+            base = "repr": Option<HourBase> => is_12_hour_clock,
+        },
+        Ignore = "ignore" {
+            #[required]
+            count = "count": Option<#[from_str] NonZero<u16>> => count,
+        },
+        Minute = "minute" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        Month = "month" {
+            padding = "padding": Option<Padding> => padding,
+            repr = "repr": Option<MonthRepr> => repr,
+            case_sensitive = "case_sensitive": Option<MonthCaseSensitive> => case_sensitive,
+        },
+        OffsetHour = "offset_hour" {
+            sign_behavior = "sign": Option<SignBehavior> => sign_is_mandatory,
+            padding = "padding": Option<Padding> => padding,
+        },
+        OffsetMinute = "offset_minute" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        OffsetSecond = "offset_second" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        Ordinal = "ordinal" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        Period = "period" {
+            case = "case": Option<PeriodCase> => is_uppercase,
+            case_sensitive = "case_sensitive": Option<PeriodCaseSensitive> => case_sensitive,
+        },
+        Second = "second" {
+            padding = "padding": Option<Padding> => padding,
+        },
+        Subsecond = "subsecond" {
+            digits = "digits": Option<SubsecondDigits> => digits,
+        },
+        UnixTimestamp = "unix_timestamp" {
+            precision = "precision": Option<UnixTimestampPrecision> => precision,
+            sign_behavior = "sign": Option<SignBehavior> => sign_is_mandatory,
+        },
+        Weekday = "weekday" {
+            repr = "repr": Option<WeekdayRepr> => repr,
+            one_indexed = "one_indexed": Option<WeekdayOneIndexed> => one_indexed,
+            case_sensitive = "case_sensitive": Option<WeekdayCaseSensitive> => case_sensitive,
+        },
+        WeekNumber = "week_number" {
+            padding = "padding": Option<Padding> => padding,
+            repr = "repr": Option<WeekNumberRepr> => repr,
+        },
+        Year = "year" {
+            padding = "padding": Option<Padding> => padding,
+            repr = "repr": Option<YearRepr> => repr,
+            range = "range": Option<YearRange> => range,
+            base = "base": Option<YearBase> => iso_week_based,
+            sign_behavior = "sign": Option<SignBehavior> => sign_is_mandatory,
+        },
+    }
+}
+
+macro_rules! target_ty {
+    ($name:ident $type:ty) => {
+        $type
+    };
+    ($name:ident) => {
+        super::public::modifier::$name
+    };
+}
+
+/// Get the target value for a given enum.
+macro_rules! target_value {
+    ($name:ident $variant:ident $value:expr) => {
+        $value
+    };
+    ($name:ident $variant:ident) => {
+        super::public::modifier::$name::$variant
+    };
+}
+
+macro_rules! modifier {
+    ($(
+        enum $name:ident $(($target_ty:ty))? {
+            $(
+                $(#[$attr:meta])?
+                $variant:ident $(($target_value:expr))? = $parse_variant:literal
+            ),* $(,)?
+        }
+    )+) => {$(
+        #[derive(Default)]
+        enum $name {
+            $($(#[$attr])? $variant),*
+        }
+
+        impl $name {
+            /// Parse the modifier from its string representation.
+            fn from_modifier_value(value: &Spanned<&[u8]>) -> Result<Option<Self>, Error> {
+                $(if value.eq_ignore_ascii_case($parse_variant) {
+                    return Ok(Some(Self::$variant));
+                })*
+                Err(value.span.error("invalid modifier value"))
+            }
+        }
+
+        impl From<$name> for target_ty!($name $($target_ty)?) {
+            fn from(modifier: $name) -> Self {
+                match modifier {
+                    $($name::$variant => target_value!($name $variant $($target_value)?)),*
+                }
+            }
+        }
+    )+};
+}
+
+modifier! {
+    enum HourBase(bool) {
+        Twelve(true) = b"12",
+        #[default]
+        TwentyFour(false) = b"24",
+    }
+
+    enum MonthCaseSensitive(bool) {
+        False(false) = b"false",
+        #[default]
+        True(true) = b"true",
+    }
+
+    enum MonthRepr {
+        #[default]
+        Numerical = b"numerical",
+        Long = b"long",
+        Short = b"short",
+    }
+
+    enum Padding {
+        Space = b"space",
+        #[default]
+        Zero = b"zero",
+        None = b"none",
+    }
+
+    enum PeriodCase(bool) {
+        Lower(false) = b"lower",
+        #[default]
+        Upper(true) = b"upper",
+    }
+
+    enum PeriodCaseSensitive(bool) {
+        False(false) = b"false",
+        #[default]
+        True(true) = b"true",
+    }
+
+    enum SignBehavior(bool) {
+        #[default]
+        Automatic(false) = b"automatic",
+        Mandatory(true) = b"mandatory",
+    }
+
+    enum SubsecondDigits {
+        One = b"1",
+        Two = b"2",
+        Three = b"3",
+        Four = b"4",
+        Five = b"5",
+        Six = b"6",
+        Seven = b"7",
+        Eight = b"8",
+        Nine = b"9",
+        #[default]
+        OneOrMore = b"1+",
+    }
+
+    enum TrailingInput {
+        #[default]
+        Prohibit = b"prohibit",
+        Discard = b"discard",
+    }
+
+    enum UnixTimestampPrecision {
+        #[default]
+        Second = b"second",
+        Millisecond = b"millisecond",
+        Microsecond = b"microsecond",
+        Nanosecond = b"nanosecond",
+    }
+
+    enum WeekNumberRepr {
+        #[default]
+        Iso = b"iso",
+        Sunday = b"sunday",
+        Monday = b"monday",
+    }
+
+    enum WeekdayCaseSensitive(bool) {
+        False(false) = b"false",
+        #[default]
+        True(true) = b"true",
+    }
+
+    enum WeekdayOneIndexed(bool) {
+        False(false) = b"false",
+        #[default]
+        True(true) = b"true",
+    }
+
+    enum WeekdayRepr {
+        Short = b"short",
+        #[default]
+        Long = b"long",
+        Sunday = b"sunday",
+        Monday = b"monday",
+    }
+
+    enum YearBase(bool) {
+        #[default]
+        Calendar(false) = b"calendar",
+        IsoWeek(true) = b"iso_week",
+    }
+
+    enum YearRepr {
+        #[default]
+        Full = b"full",
+        Century = b"century",
+        LastTwo = b"last_two",
+    }
+
+    enum YearRange {
+        Standard = b"standard",
+        #[default]
+        Extended = b"extended",
+    }
+}
+
+fn parse_from_modifier_value<T: FromStr>(value: &Spanned<&[u8]>) -> Result<Option<T>, Error> {
+    str::from_utf8(value)
+        .ok()
+        .and_then(|val| val.parse::<T>().ok())
+        .map(|val| Some(val))
+        .ok_or_else(|| value.span.error("invalid modifier value"))
+}

vendor/time-macros/src/format_description/lexer.rs

@@ -0,0 +1,245 @@
+use core::iter;
+
+use super::{Error, Location, Spanned, SpannedValue};
+
+pub(super) struct Lexed<I: Iterator> {
+    iter: iter::Peekable<I>,
+}
+
+impl<I: Iterator> Iterator for Lexed<I> {
+    type Item = I::Item;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+impl<'iter, 'token: 'iter, I: Iterator<Item = Result<Token<'token>, Error>> + 'iter> Lexed<I> {
+    pub(super) fn peek(&mut self) -> Option<&I::Item> {
+        self.iter.peek()
+    }
+
+    pub(super) fn next_if_whitespace(&mut self) -> Option<Spanned<&'token [u8]>> {
+        if let Some(&Ok(Token::ComponentPart {
+            kind: ComponentKind::Whitespace,
+            value,
+        })) = self.peek()
+        {
+            self.next(); // consume
+            Some(value)
+        } else {
+            None
+        }
+    }
+
+    pub(super) fn next_if_not_whitespace(&mut self) -> Option<Spanned<&'token [u8]>> {
+        if let Some(&Ok(Token::ComponentPart {
+            kind: ComponentKind::NotWhitespace,
+            value,
+        })) = self.peek()
+        {
+            self.next();
+            Some(value)
+        } else {
+            None
+        }
+    }
+
+    pub(super) fn next_if_opening_bracket(&mut self) -> Option<Location> {
+        if let Some(&Ok(Token::Bracket {
+            kind: BracketKind::Opening,
+            location,
+        })) = self.peek()
+        {
+            self.next();
+            Some(location)
+        } else {
+            None
+        }
+    }
+
+    pub(super) fn peek_closing_bracket(&'iter mut self) -> Option<&'iter Location> {
+        if let Some(Ok(Token::Bracket {
+            kind: BracketKind::Closing,
+            location,
+        })) = self.peek()
+        {
+            Some(location)
+        } else {
+            None
+        }
+    }
+
+    pub(super) fn next_if_closing_bracket(&mut self) -> Option<Location> {
+        if let Some(&Ok(Token::Bracket {
+            kind: BracketKind::Closing,
+            location,
+        })) = self.peek()
+        {
+            self.next();
+            Some(location)
+        } else {
+            None
+        }
+    }
+}
+
+pub(super) enum Token<'a> {
+    Literal(Spanned<&'a [u8]>),
+    Bracket {
+        kind: BracketKind,
+        location: Location,
+    },
+    ComponentPart {
+        kind: ComponentKind,
+        value: Spanned<&'a [u8]>,
+    },
+}
+
+pub(super) enum BracketKind {
+    Opening,
+    Closing,
+}
+
+pub(super) enum ComponentKind {
+    Whitespace,
+    NotWhitespace,
+}
+
+fn attach_location<'item>(
+    iter: impl Iterator<Item = &'item u8>,
+    proc_span: proc_macro::Span,
+) -> impl Iterator<Item = (&'item u8, Location)> {
+    let mut byte_pos = 0;
+
+    iter.map(move |byte| {
+        let location = Location {
+            byte: byte_pos,
+            proc_span,
+        };
+        byte_pos += 1;
+        (byte, location)
+    })
+}
+
+pub(super) fn lex<const VERSION: u8>(
+    mut input: &[u8],
+    proc_span: proc_macro::Span,
+) -> Lexed<impl Iterator<Item = Result<Token<'_>, Error>>> {
+    assert!(version!(1..=2));
+
+    let mut depth: u32 = 0;
+    let mut iter = attach_location(input.iter(), proc_span).peekable();
+    let mut second_bracket_location = None;
+
+    let iter = iter::from_fn(move || {
+        if version!(..=1)
+            && let Some(location) = second_bracket_location.take()
+        {
+            return Some(Ok(Token::Bracket {
+                kind: BracketKind::Opening,
+                location,
+            }));
+        }
+
+        Some(Ok(match iter.next()? {
+            (b'\\', backslash_loc) if version!(2..) => match iter.next() {
+                Some((b'\\' | b'[' | b']', char_loc)) => {
+                    let char = &input[1..2];
+                    input = &input[2..];
+                    if depth == 0 {
+                        Token::Literal(char.spanned(backslash_loc.to(char_loc)))
+                    } else {
+                        Token::ComponentPart {
+                            kind: ComponentKind::NotWhitespace,
+                            value: char.spanned(backslash_loc.to(char_loc)),
+                        }
+                    }
+                }
+                Some((_, loc)) => {
+                    return Some(Err(loc.error("invalid escape sequence")));
+                }
+                None => {
+                    return Some(Err(backslash_loc.error("unexpected end of input")));
+                }
+            },
+            (b'[', location) if version!(..=1) => {
+                if let Some((_, second_location)) = iter.next_if(|&(&byte, _)| byte == b'[') {
+                    second_bracket_location = Some(second_location);
+                    input = &input[2..];
+                } else {
+                    depth += 1;
+                    input = &input[1..];
+                }
+
+                Token::Bracket {
+                    kind: BracketKind::Opening,
+                    location,
+                }
+            }
+            (b'[', location) => {
+                depth += 1;
+                input = &input[1..];
+
+                Token::Bracket {
+                    kind: BracketKind::Opening,
+                    location,
+                }
+            }
+            (b']', location) if depth > 0 => {
+                depth -= 1;
+                input = &input[1..];
+
+                Token::Bracket {
+                    kind: BracketKind::Closing,
+                    location,
+                }
+            }
+            (_, start_location) if depth == 0 => {
+                let mut bytes = 1;
+                let mut end_location = start_location;
+
+                while let Some((_, location)) =
+                    iter.next_if(|&(&byte, _)| !((version!(2..) && byte == b'\\') || byte == b'['))
+                {
+                    end_location = location;
+                    bytes += 1;
+                }
+
+                let value = &input[..bytes];
+                input = &input[bytes..];
+
+                Token::Literal(value.spanned(start_location.to(end_location)))
+            }
+            (byte, start_location) => {
+                let mut bytes = 1;
+                let mut end_location = start_location;
+                let is_whitespace = byte.is_ascii_whitespace();
+
+                while let Some((_, location)) = iter.next_if(|&(byte, _)| {
+                    !matches!(byte, b'\\' | b'[' | b']')
+                        && is_whitespace == byte.is_ascii_whitespace()
+                }) {
+                    end_location = location;
+                    bytes += 1;
+                }
+
+                let value = &input[..bytes];
+                input = &input[bytes..];
+
+                Token::ComponentPart {
+                    kind: if is_whitespace {
+                        ComponentKind::Whitespace
+                    } else {
+                        ComponentKind::NotWhitespace
+                    },
+                    value: value.spanned(start_location.to(end_location)),
+                }
+            }
+        }))
+    });
+
+    Lexed {
+        iter: iter.peekable(),
+    }
+}

vendor/time-macros/src/format_description/mod.rs

@@ -0,0 +1,166 @@
+//! Parser for format descriptions.
+
+macro_rules! version {
+    ($range:expr) => {
+        $range.contains(&VERSION)
+    };
+}
+
+mod ast;
+mod format_item;
+mod lexer;
+mod public;
+
+pub(crate) fn parse_with_version(
+    version: Option<crate::FormatDescriptionVersion>,
+    s: &[u8],
+    proc_span: proc_macro::Span,
+) -> Result<Vec<public::OwnedFormatItem>, crate::Error> {
+    match version {
+        Some(crate::FormatDescriptionVersion::V1) | None => parse::<1>(s, proc_span),
+        Some(crate::FormatDescriptionVersion::V2) => parse::<2>(s, proc_span),
+    }
+}
+
+fn parse<const VERSION: u8>(
+    s: &[u8],
+    proc_span: proc_macro::Span,
+) -> Result<Vec<public::OwnedFormatItem>, crate::Error> {
+    let mut lexed = lexer::lex::<VERSION>(s, proc_span);
+    let ast = ast::parse::<_, VERSION>(&mut lexed);
+    let format_items = format_item::parse(ast);
+    Ok(format_items
+        .map(|res| res.map(Into::into))
+        .collect::<Result<_, _>>()?)
+}
+
+#[derive(Clone, Copy)]
+struct Location {
+    byte: u32,
+    proc_span: proc_macro::Span,
+}
+
+impl Location {
+    fn to(self, end: Self) -> Span {
+        Span { start: self, end }
+    }
+
+    #[must_use = "this does not modify the original value"]
+    fn offset(&self, offset: u32) -> Self {
+        Self {
+            byte: self.byte + offset,
+            proc_span: self.proc_span,
+        }
+    }
+
+    fn error(self, message: &'static str) -> Error {
+        Error {
+            message,
+            _span: unused(Span {
+                start: self,
+                end: self,
+            }),
+            proc_span: self.proc_span,
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+struct Span {
+    start: Location,
+    end: Location,
+}
+
+impl Span {
+    #[must_use = "this does not modify the original value"]
+    const fn shrink_to_start(&self) -> Self {
+        Self {
+            start: self.start,
+            end: self.start,
+        }
+    }
+
+    #[must_use = "this does not modify the original value"]
+    const fn shrink_to_end(&self) -> Self {
+        Self {
+            start: self.end,
+            end: self.end,
+        }
+    }
+
+    #[must_use = "this does not modify the original value"]
+    const fn shrink_to_before(&self, pos: u32) -> Self {
+        Self {
+            start: self.start,
+            end: Location {
+                byte: self.start.byte + pos - 1,
+                proc_span: self.start.proc_span,
+            },
+        }
+    }
+
+    #[must_use = "this does not modify the original value"]
+    fn shrink_to_after(&self, pos: u32) -> Self {
+        Self {
+            start: Location {
+                byte: self.start.byte + pos + 1,
+                proc_span: self.start.proc_span,
+            },
+            end: self.end,
+        }
+    }
+
+    fn error(self, message: &'static str) -> Error {
+        Error {
+            message,
+            _span: unused(self),
+            proc_span: self.start.proc_span,
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+struct Spanned<T> {
+    value: T,
+    span: Span,
+}
+
+impl<T> core::ops::Deref for Spanned<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.value
+    }
+}
+
+trait SpannedValue: Sized {
+    fn spanned(self, span: Span) -> Spanned<Self>;
+}
+
+impl<T> SpannedValue for T {
+    fn spanned(self, span: Span) -> Spanned<Self> {
+        Spanned { value: self, span }
+    }
+}
+
+struct Error {
+    message: &'static str,
+    _span: Unused<Span>,
+    proc_span: proc_macro::Span,
+}
+
+impl From<Error> for crate::Error {
+    fn from(error: Error) -> Self {
+        Self::Custom {
+            message: error.message.into(),
+            span_start: Some(error.proc_span),
+            span_end: Some(error.proc_span),
+        }
+    }
+}
+
+struct Unused<T>(core::marker::PhantomData<T>);
+
+fn unused<T>(_: T) -> Unused<T> {
+    Unused(core::marker::PhantomData)
+}

vendor/time-macros/src/format_description/public/component.rs

@@ -0,0 +1,50 @@
+use proc_macro::{Ident, Span, TokenStream};
+
+use super::modifier;
+use crate::to_tokens::ToTokenStream;
+
+macro_rules! declare_component {
+    ($($name:ident)*) => {
+        pub(crate) enum Component {$(
+            $name(modifier::$name),
+        )*}
+
+        impl ToTokenStream for Component {
+            fn append_to(self, ts: &mut TokenStream) {
+                let mut mts = TokenStream::new();
+
+                let component = match self {$(
+                    Self::$name(modifier) => {
+                        modifier.append_to(&mut mts);
+                        stringify!($name)
+                    }
+                )*};
+                let component = Ident::new(component, Span::mixed_site());
+
+                quote_append! { ts
+                    Component::#(component)(#S(mts))
+                }
+            }
+        }
+    };
+}
+
+declare_component! {
+    Day
+    Month
+    Ordinal
+    Weekday
+    WeekNumber
+    Year
+    Hour
+    Minute
+    Period
+    Second
+    Subsecond
+    OffsetHour
+    OffsetMinute
+    OffsetSecond
+    Ignore
+    UnixTimestamp
+    End
+}

vendor/time-macros/src/format_description/public/mod.rs

@@ -0,0 +1,51 @@
+mod component;
+pub(super) mod modifier;
+
+use proc_macro::TokenStream;
+
+pub(crate) use self::component::Component;
+use crate::to_tokens::ToTokenStream;
+
+pub(crate) enum OwnedFormatItem {
+    Literal(Box<[u8]>),
+    Component(Component),
+    Compound(Box<[Self]>),
+    Optional(Box<Self>),
+    First(Box<[Self]>),
+}
+
+impl ToTokenStream for OwnedFormatItem {
+    fn append_to(self, ts: &mut TokenStream) {
+        match self {
+            Self::Literal(bytes) => quote_append! { ts
+                BorrowedFormatItem::Literal(#(Literal::byte_string(bytes.as_ref())))
+            },
+            Self::Component(component) => quote_append! { ts
+                BorrowedFormatItem::Component { 0: #S(component) }
+            },
+            Self::Compound(items) => {
+                let items = items
+                    .into_vec()
+                    .into_iter()
+                    .map(|item| quote_! { #S(item), })
+                    .collect::<TokenStream>();
+                quote_append! { ts
+                    BorrowedFormatItem::Compound { 0: &[#S(items)] }
+                }
+            }
+            Self::Optional(item) => quote_append! { ts
+                BorrowedFormatItem::Optional { 0: &#S(*item) }
+            },
+            Self::First(items) => {
+                let items = items
+                    .into_vec()
+                    .into_iter()
+                    .map(|item| quote_! { #S(item), })
+                    .collect::<TokenStream>();
+                quote_append! { ts
+                    BorrowedFormatItem::First { 0: &[#S(items)] }
+                }
+            }
+        }
+    }
+}

vendor/time-macros/src/format_description/public/modifier.rs

@@ -0,0 +1,277 @@
+use std::num::NonZero;
+
+use proc_macro::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
+
+use crate::to_tokens::{ToTokenStream, ToTokenTree};
+
+macro_rules! to_tokens {
+    (
+        $(#[$struct_attr:meta])*
+        $struct_vis:vis struct $struct_name:ident {$(
+            $(#[$field_attr:meta])*
+            $field_vis:vis $field_name:ident : $field_ty:ty = $default:pat
+        ),* $(,)?}
+    ) => {
+        $(#[$struct_attr])*
+        $struct_vis struct $struct_name {$(
+            $(#[$field_attr])*
+            $field_vis $field_name: $field_ty
+        ),*}
+
+        impl ToTokenTree for $struct_name {
+            fn into_token_tree(self) -> TokenTree {
+                let Self {$($field_name),*} = self;
+
+                #[allow(clippy::redundant_pattern_matching)]
+                if matches!(($(&$field_name,)*), ($($default,)*)) {
+                    return TokenTree::Group(Group::new(
+                        Delimiter::None,
+                        quote_! { $struct_name::default() }
+                    ));
+                }
+
+                let mut tokens = quote_! {
+                    $struct_name::default()
+                };
+                $(
+                    #[allow(clippy::redundant_pattern_matching)]
+                    if !matches!($field_name, $default) {
+                        let method_name = Ident::new(concat!("with_", stringify!($field_name)), Span::mixed_site());
+                        quote_append!(tokens .#(method_name)(#S($field_name)));
+                    }
+                )*
+
+                TokenTree::Group(Group::new(
+                    Delimiter::Brace,
+                    tokens,
+                ))
+            }
+        }
+    };
+
+    (
+        $(#[$enum_attr:meta])*
+        $enum_vis:vis enum $enum_name:ident {$(
+            $(#[$variant_attr:meta])*
+            $variant_name:ident
+        ),+ $(,)?}
+    ) => {
+        $(#[$enum_attr])*
+        $enum_vis enum $enum_name {$(
+            $(#[$variant_attr])*
+            $variant_name
+        ),+}
+
+        impl ToTokenStream for $enum_name {
+            fn append_to(self, ts: &mut TokenStream) {
+                quote_append! { ts
+                    $enum_name::
+                };
+                let name = match self {
+                    $(Self::$variant_name => stringify!($variant_name)),+
+                };
+                ts.extend([TokenTree::Ident(Ident::new(name, Span::mixed_site()))]);
+            }
+        }
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Day {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum MonthRepr {
+        Numerical,
+        Long,
+        Short,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Month {
+        pub(crate) padding: Padding = Padding::Zero,
+        pub(crate) repr: MonthRepr = MonthRepr::Numerical,
+        pub(crate) case_sensitive: bool = true,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Ordinal {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum WeekdayRepr {
+        Short,
+        Long,
+        Sunday,
+        Monday,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Weekday {
+        pub(crate) repr: WeekdayRepr = WeekdayRepr::Long,
+        pub(crate) one_indexed: bool = true,
+        pub(crate) case_sensitive: bool = true,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum WeekNumberRepr {
+        Iso,
+        Sunday,
+        Monday,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct WeekNumber {
+        pub(crate) padding: Padding = Padding::Zero,
+        pub(crate) repr: WeekNumberRepr = WeekNumberRepr::Iso,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum YearRepr {
+        Full,
+        Century,
+        LastTwo,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum YearRange {
+        Standard,
+        Extended,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Year {
+        pub(crate) padding: Padding = Padding::Zero,
+        pub(crate) repr: YearRepr = YearRepr::Full,
+        pub(crate) range: YearRange = YearRange::Extended,
+        pub(crate) iso_week_based: bool = false,
+        pub(crate) sign_is_mandatory: bool = false,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Hour {
+        pub(crate) padding: Padding = Padding::Zero,
+        pub(crate) is_12_hour_clock: bool = false,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Minute {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Period {
+        pub(crate) is_uppercase: bool = true,
+        pub(crate) case_sensitive: bool = true,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Second {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum SubsecondDigits {
+        One,
+        Two,
+        Three,
+        Four,
+        Five,
+        Six,
+        Seven,
+        Eight,
+        Nine,
+        OneOrMore,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct Subsecond {
+        pub(crate) digits: SubsecondDigits = SubsecondDigits::OneOrMore,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct OffsetHour {
+        pub(crate) sign_is_mandatory: bool = false,
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct OffsetMinute {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct OffsetSecond {
+        pub(crate) padding: Padding = Padding::Zero,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum Padding {
+        Space,
+        Zero,
+        None,
+    }
+}
+
+pub(crate) struct Ignore {
+    pub(crate) count: NonZero<u16>,
+}
+
+impl ToTokenTree for Ignore {
+    fn into_token_tree(self) -> TokenTree {
+        quote_group! {{
+            Ignore::count(#(self.count))
+        }}
+    }
+}
+
+to_tokens! {
+    pub(crate) enum UnixTimestampPrecision {
+        Second,
+        Millisecond,
+        Microsecond,
+        Nanosecond,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct UnixTimestamp {
+        pub(crate) precision: UnixTimestampPrecision = UnixTimestampPrecision::Second,
+        pub(crate) sign_is_mandatory: bool = false,
+    }
+}
+
+to_tokens! {
+    pub(crate) enum TrailingInput {
+        Prohibit,
+        Discard,
+    }
+}
+
+to_tokens! {
+    pub(crate) struct End {
+        pub(crate) trailing_input: TrailingInput = TrailingInput::Prohibit,
+    }
+}

vendor/time-macros/src/helpers/mod.rs

@@ -0,0 +1,131 @@
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+mod string;
+
+use std::iter::Peekable;
+use std::str::FromStr;
+
+use num_conv::prelude::*;
+use proc_macro::{Span, TokenTree, token_stream};
+use time_core::util::{days_in_year, is_leap_year};
+
+use crate::Error;
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+pub(crate) fn get_string_literal(
+    mut tokens: impl Iterator<Item = TokenTree>,
+) -> Result<(Span, Vec<u8>), Error> {
+    match (tokens.next(), tokens.next()) {
+        (Some(TokenTree::Literal(literal)), None) => string::parse(&literal),
+        (Some(tree), None) => Err(Error::ExpectedString {
+            span_start: Some(tree.span()),
+            span_end: Some(tree.span()),
+        }),
+        (_, Some(tree)) => Err(Error::UnexpectedToken { tree }),
+        (None, None) => Err(Error::ExpectedString {
+            span_start: None,
+            span_end: None,
+        }),
+    }
+}
+
+pub(crate) fn consume_number<T: FromStr>(
+    component_name: &'static str,
+    chars: &mut Peekable<token_stream::IntoIter>,
+) -> Result<(Span, T), Error> {
+    let (span, digits) = match chars.next() {
+        Some(TokenTree::Literal(literal)) => (literal.span(), literal.to_string()),
+        Some(tree) => return Err(Error::UnexpectedToken { tree }),
+        None => return Err(Error::UnexpectedEndOfInput),
+    };
+
+    if let Ok(value) = digits.replace('_', "").parse() {
+        Ok((span, value))
+    } else {
+        Err(Error::InvalidComponent {
+            name: component_name,
+            value: digits,
+            span_start: Some(span),
+            span_end: Some(span),
+        })
+    }
+}
+
+pub(crate) fn consume_any_ident(
+    idents: &[&str],
+    chars: &mut Peekable<token_stream::IntoIter>,
+) -> Result<Span, Error> {
+    match chars.peek() {
+        Some(TokenTree::Ident(char)) if idents.contains(&char.to_string().as_str()) => {
+            let ret = Ok(char.span());
+            drop(chars.next());
+            ret
+        }
+        Some(tree) => Err(Error::UnexpectedToken { tree: tree.clone() }),
+        None => Err(Error::UnexpectedEndOfInput),
+    }
+}
+
+pub(crate) fn consume_punct(
+    c: char,
+    chars: &mut Peekable<token_stream::IntoIter>,
+) -> Result<Span, Error> {
+    match chars.peek() {
+        Some(TokenTree::Punct(punct)) if *punct == c => {
+            let ret = Ok(punct.span());
+            drop(chars.next());
+            ret
+        }
+        Some(tree) => Err(Error::UnexpectedToken { tree: tree.clone() }),
+        None => Err(Error::UnexpectedEndOfInput),
+    }
+}
+
+fn jan_weekday(year: i32, ordinal: i32) -> u8 {
+    macro_rules! div_floor {
+        ($a:expr, $b:expr) => {{
+            let (_quotient, _remainder) = ($a / $b, $a % $b);
+            if (_remainder > 0 && $b < 0) || (_remainder < 0 && $b > 0) {
+                _quotient - 1
+            } else {
+                _quotient
+            }
+        }};
+    }
+
+    let adj_year = year - 1;
+    (ordinal + adj_year + div_floor!(adj_year, 4) - div_floor!(adj_year, 100)
+        + div_floor!(adj_year, 400)
+        + 6)
+    .rem_euclid(7)
+    .cast_unsigned()
+    .truncate()
+}
+
+pub(crate) fn days_in_year_month(year: i32, month: u8) -> u8 {
+    [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month.extend::<usize>() - 1]
+        + u8::from(month == 2 && is_leap_year(year))
+}
+
+pub(crate) fn ywd_to_yo(year: i32, week: u8, iso_weekday_number: u8) -> (i32, u16) {
+    let (ordinal, overflow) = (u16::from(week) * 7 + u16::from(iso_weekday_number))
+        .overflowing_sub(u16::from(jan_weekday(year, 4)) + 4);
+
+    if overflow || ordinal == 0 {
+        return (year - 1, (ordinal.wrapping_add(days_in_year(year - 1))));
+    }
+
+    let days_in_cur_year = days_in_year(year);
+    if ordinal > days_in_cur_year {
+        (year + 1, ordinal - days_in_cur_year)
+    } else {
+        (year, ordinal)
+    }
+}
+
+pub(crate) fn ymd_to_yo(year: i32, month: u8, day: u8) -> (i32, u16) {
+    let ordinal = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
+        [month.extend::<usize>() - 1]
+        + u16::from(month > 2 && is_leap_year(year));
+
+    (year, ordinal + u16::from(day))
+}

vendor/time-macros/src/helpers/string.rs

@@ -0,0 +1,188 @@
+use std::ops::{Index, RangeFrom};
+
+use proc_macro::Span;
+
+use crate::Error;
+
+pub(crate) fn parse(token: &proc_macro::Literal) -> Result<(Span, Vec<u8>), Error> {
+    let span = token.span();
+    let repr = token.to_string();
+
+    match repr.as_bytes() {
+        [b'"', ..] => Ok((span, parse_lit_str_cooked(&repr[1..]))),
+        [b'b', b'"', rest @ ..] => Ok((span, parse_lit_byte_str_cooked(rest))),
+        [b'r', rest @ ..] | [b'b', b'r', rest @ ..] => Ok((span, parse_lit_str_raw(rest))),
+        _ => Err(Error::ExpectedString {
+            span_start: Some(span),
+            span_end: Some(span),
+        }),
+    }
+}
+
+fn byte(s: impl AsRef<[u8]>, idx: usize) -> u8 {
+    s.as_ref().get(idx).copied().unwrap_or_default()
+}
+
+fn parse_lit_str_cooked(mut s: &str) -> Vec<u8> {
+    let mut content = String::new();
+    'outer: loop {
+        let ch = match byte(s, 0) {
+            b'"' => break,
+            b'\\' => {
+                let b = byte(s, 1);
+                s = &s[2..];
+                match b {
+                    b'x' => {
+                        let (byte, rest) = backslash_x(s);
+                        s = rest;
+                        char::from_u32(u32::from(byte)).expect("byte was just validated")
+                    }
+                    b'u' => {
+                        let (chr, rest) = backslash_u(s);
+                        s = rest;
+                        chr
+                    }
+                    b'n' => '\n',
+                    b'r' => '\r',
+                    b't' => '\t',
+                    b'\\' => '\\',
+                    b'0' => '\0',
+                    b'\'' => '\'',
+                    b'"' => '"',
+                    b'\r' | b'\n' => loop {
+                        let ch = s.chars().next().unwrap_or_default();
+                        if ch.is_whitespace() {
+                            s = &s[ch.len_utf8()..];
+                        } else {
+                            continue 'outer;
+                        }
+                    },
+                    _ => bug!("invalid escape"),
+                }
+            }
+            b'\r' => {
+                // bare CR not permitted
+                s = &s[2..];
+                '\n'
+            }
+            _ => {
+                let ch = s.chars().next().unwrap_or_default();
+                s = &s[ch.len_utf8()..];
+                ch
+            }
+        };
+        content.push(ch);
+    }
+
+    content.into_bytes()
+}
+
+fn parse_lit_str_raw(s: &[u8]) -> Vec<u8> {
+    let mut pounds = 0;
+    while byte(s, pounds) == b'#' {
+        pounds += 1;
+    }
+    let close = s
+        .iter()
+        .rposition(|&b| b == b'"')
+        .expect("had a string without trailing \"");
+
+    s[pounds + 1..close].to_owned()
+}
+
+fn parse_lit_byte_str_cooked(mut v: &[u8]) -> Vec<u8> {
+    let mut out = Vec::new();
+    'outer: loop {
+        let byte = match byte(v, 0) {
+            b'"' => break,
+            b'\\' => {
+                let b = byte(v, 1);
+                v = &v[2..];
+                match b {
+                    b'x' => {
+                        let (byte, rest) = backslash_x(v);
+                        v = rest;
+                        byte
+                    }
+                    b'n' => b'\n',
+                    b'r' => b'\r',
+                    b't' => b'\t',
+                    b'\\' => b'\\',
+                    b'0' => b'\0',
+                    b'\'' => b'\'',
+                    b'"' => b'"',
+                    b'\r' | b'\n' => loop {
+                        let byte = byte(v, 0);
+                        let ch = char::from_u32(u32::from(byte)).expect("invalid byte");
+                        if ch.is_whitespace() {
+                            v = &v[1..];
+                        } else {
+                            continue 'outer;
+                        }
+                    },
+                    _ => bug!("invalid escape"),
+                }
+            }
+            b'\r' => {
+                // bare CR not permitted
+                v = &v[2..];
+                b'\n'
+            }
+            b => {
+                v = &v[1..];
+                b
+            }
+        };
+        out.push(byte);
+    }
+
+    out
+}
+
+fn backslash_x<S>(s: &S) -> (u8, &S)
+where
+    S: Index<RangeFrom<usize>, Output = S> + AsRef<[u8]> + ?Sized,
+{
+    let mut ch = 0;
+    let b0 = byte(s, 0);
+    let b1 = byte(s, 1);
+    ch += 0x10 * (b0 - b'0');
+    ch += match b1 {
+        b'0'..=b'9' => b1 - b'0',
+        b'a'..=b'f' => 10 + (b1 - b'a'),
+        b'A'..=b'F' => 10 + (b1 - b'A'),
+        _ => bug!("invalid hex escape"),
+    };
+    (ch, &s[2..])
+}
+
+fn backslash_u(mut s: &str) -> (char, &str) {
+    s = &s[1..];
+
+    let mut ch = 0;
+    let mut digits = 0;
+    loop {
+        let b = byte(s, 0);
+        let digit = match b {
+            b'0'..=b'9' => b - b'0',
+            b'a'..=b'f' => 10 + b - b'a',
+            b'A'..=b'F' => 10 + b - b'A',
+            b'_' if digits > 0 => {
+                s = &s[1..];
+                continue;
+            }
+            b'}' if digits != 0 => break,
+            _ => bug!("invalid unicode escape"),
+        };
+        ch *= 0x10;
+        ch += u32::from(digit);
+        digits += 1;
+        s = &s[1..];
+    }
+    s = &s[1..];
+
+    (
+        char::from_u32(ch).expect("invalid unicode escape passed by compiler"),
+        s,
+    )
+}

vendor/time-macros/src/lib.rs

@@ -0,0 +1,280 @@
+#![allow(
+    clippy::missing_const_for_fn,
+    clippy::std_instead_of_core,
+    clippy::std_instead_of_alloc,
+    clippy::alloc_instead_of_core,
+    reason = "irrelevant for proc macros"
+)]
+#![allow(
+    clippy::missing_docs_in_private_items,
+    missing_docs,
+    reason = "may be removed eventually"
+)]
+
+#[allow(
+    unused_macros,
+    reason = "may not be used for all feature flag combinations"
+)]
+macro_rules! bug {
+    () => { compile_error!("provide an error message to help fix a possible bug") };
+    ($descr:literal $($rest:tt)?) => {
+        unreachable!(concat!("internal error: ", $descr) $($rest)?)
+    }
+}
+
+#[macro_use]
+mod quote;
+
+mod date;
+mod datetime;
+mod error;
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+mod format_description;
+mod helpers;
+mod offset;
+#[cfg(all(feature = "serde", any(feature = "formatting", feature = "parsing")))]
+mod serde_format_description;
+mod time;
+mod to_tokens;
+mod utc_datetime;
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+use std::iter::Peekable;
+
+#[cfg(all(feature = "serde", any(feature = "formatting", feature = "parsing")))]
+use proc_macro::Delimiter;
+use proc_macro::TokenStream;
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+use proc_macro::TokenTree;
+
+use self::error::Error;
+
+macro_rules! impl_macros {
+    ($($name:ident)*) => {$(
+        #[proc_macro]
+        pub fn $name(input: TokenStream) -> TokenStream {
+            use crate::to_tokens::ToTokenStream;
+
+            let mut iter = input.into_iter().peekable();
+            match $name::parse(&mut iter) {
+                Ok(value) => match iter.peek() {
+                    Some(tree) => Error::UnexpectedToken { tree: tree.clone() }.to_compile_error(),
+                    None => quote_! { const { #S(value.into_token_stream()) } },
+                },
+                Err(err) => err.to_compile_error(),
+            }
+        }
+    )*};
+}
+
+impl_macros![date datetime utc_datetime offset time];
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+type PeekableTokenStreamIter = Peekable<proc_macro::token_stream::IntoIter>;
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+enum FormatDescriptionVersion {
+    V1,
+    V2,
+}
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+fn parse_format_description_version<const NO_EQUALS_IS_MOD_NAME: bool>(
+    iter: &mut PeekableTokenStreamIter,
+) -> Result<Option<FormatDescriptionVersion>, Error> {
+    let end_of_input_err = || {
+        if NO_EQUALS_IS_MOD_NAME {
+            Error::UnexpectedEndOfInput
+        } else {
+            Error::ExpectedString {
+                span_start: None,
+                span_end: None,
+            }
+        }
+    };
+    let version_ident = match iter.peek().ok_or_else(end_of_input_err)? {
+        version @ TokenTree::Ident(ident) if ident.to_string() == "version" => {
+            let version_ident = version.clone();
+            iter.next(); // consume `version`
+            version_ident
+        }
+        _ => return Ok(None),
+    };
+
+    match iter.peek() {
+        Some(TokenTree::Punct(punct)) if punct.as_char() == '=' => iter.next(),
+        _ if NO_EQUALS_IS_MOD_NAME => {
+            // Push the `version` ident to the front of the iterator.
+            *iter = std::iter::once(version_ident)
+                .chain(iter.clone())
+                .collect::<TokenStream>()
+                .into_iter()
+                .peekable();
+            return Ok(None);
+        }
+        Some(token) => {
+            return Err(Error::Custom {
+                message: "expected `=`".into(),
+                span_start: Some(token.span()),
+                span_end: Some(token.span()),
+            });
+        }
+        None => {
+            return Err(Error::Custom {
+                message: "expected `=`".into(),
+                span_start: None,
+                span_end: None,
+            });
+        }
+    };
+    let version_literal = match iter.next() {
+        Some(TokenTree::Literal(literal)) => literal,
+        Some(token) => {
+            return Err(Error::Custom {
+                message: "expected 1 or 2".into(),
+                span_start: Some(token.span()),
+                span_end: Some(token.span()),
+            });
+        }
+        None => {
+            return Err(Error::Custom {
+                message: "expected 1 or 2".into(),
+                span_start: None,
+                span_end: None,
+            });
+        }
+    };
+    let version = match version_literal.to_string().as_str() {
+        "1" => FormatDescriptionVersion::V1,
+        "2" => FormatDescriptionVersion::V2,
+        _ => {
+            return Err(Error::Custom {
+                message: "invalid format description version".into(),
+                span_start: Some(version_literal.span()),
+                span_end: Some(version_literal.span()),
+            });
+        }
+    };
+    helpers::consume_punct(',', iter)?;
+
+    Ok(Some(version))
+}
+
+#[cfg(all(feature = "serde", any(feature = "formatting", feature = "parsing")))]
+fn parse_visibility(iter: &mut PeekableTokenStreamIter) -> Result<TokenStream, Error> {
+    let mut visibility = match iter.peek().ok_or(Error::UnexpectedEndOfInput)? {
+        pub_ident @ TokenTree::Ident(ident) if ident.to_string() == "pub" => {
+            let visibility = quote_! { #(pub_ident.clone()) };
+            iter.next(); // consume `pub`
+            visibility
+        }
+        _ => return Ok(quote_! {}),
+    };
+
+    match iter.peek().ok_or(Error::UnexpectedEndOfInput)? {
+        group @ TokenTree::Group(path) if path.delimiter() == Delimiter::Parenthesis => {
+            visibility.extend(std::iter::once(group.clone()));
+            iter.next(); // consume parentheses and path
+        }
+        _ => {}
+    }
+
+    Ok(visibility)
+}
+
+#[cfg(any(feature = "formatting", feature = "parsing"))]
+#[proc_macro]
+pub fn format_description(input: TokenStream) -> TokenStream {
+    (|| {
+        let mut input = input.into_iter().peekable();
+        let version = parse_format_description_version::<false>(&mut input)?;
+        let (span, string) = helpers::get_string_literal(input)?;
+        let items = format_description::parse_with_version(version, &string, span)?;
+
+        Ok(quote_! {
+            const {
+                use ::time::format_description::{*, modifier::*};
+                &[#S(
+                    items
+                        .into_iter()
+                        .map(|item| quote_! { #S(item), })
+                        .collect::<TokenStream>()
+                )] as StaticFormatDescription
+            }
+        })
+    })()
+    .unwrap_or_else(|err: Error| err.to_compile_error())
+}
+
+#[cfg(all(feature = "serde", any(feature = "formatting", feature = "parsing")))]
+#[proc_macro]
+pub fn serde_format_description(input: TokenStream) -> TokenStream {
+    (|| {
+        let mut tokens = input.into_iter().peekable();
+
+        // First, the optional format description version.
+        let version = parse_format_description_version::<true>(&mut tokens)?;
+
+        // Then, the visibility of the module.
+        let visibility = parse_visibility(&mut tokens)?;
+
+        // Next, an identifier (the desired module name)
+        let mod_name = match tokens.next() {
+            Some(TokenTree::Ident(ident)) => Ok(ident),
+            Some(tree) => Err(Error::UnexpectedToken { tree }),
+            None => Err(Error::UnexpectedEndOfInput),
+        }?;
+
+        // Followed by a comma
+        helpers::consume_punct(',', &mut tokens)?;
+
+        // Then, the type to create serde serializers for (e.g., `OffsetDateTime`).
+        let formattable = match tokens.next() {
+            Some(tree @ TokenTree::Ident(_)) => Ok(tree),
+            Some(tree) => Err(Error::UnexpectedToken { tree }),
+            None => Err(Error::UnexpectedEndOfInput),
+        }?;
+
+        // Another comma
+        helpers::consume_punct(',', &mut tokens)?;
+
+        // We now have two options. The user can either provide a format description as a string or
+        // they can provide a path to a format description. If the latter, all remaining tokens are
+        // assumed to be part of the path.
+        let (format, format_description_display) = match tokens.peek() {
+            // string literal
+            Some(TokenTree::Literal(_)) => {
+                let (span, format_string) = helpers::get_string_literal(tokens)?;
+                let items = format_description::parse_with_version(version, &format_string, span)?;
+                let items: TokenStream = items
+                    .into_iter()
+                    .map(|item| quote_! { #S(item), })
+                    .collect();
+                let items = quote_! {
+                    const {
+                        use ::time::format_description::{*, modifier::*};
+                        &[#S(items)] as StaticFormatDescription
+                    }
+                };
+
+                (items, String::from_utf8_lossy(&format_string).into_owned())
+            }
+            // path
+            Some(_) => {
+                let tokens = tokens.collect::<TokenStream>();
+                let tokens_string = tokens.to_string();
+                (tokens, tokens_string)
+            }
+            None => return Err(Error::UnexpectedEndOfInput),
+        };
+
+        Ok(serde_format_description::build(
+            visibility,
+            mod_name,
+            formattable,
+            format,
+            format_description_display,
+        ))
+    })()
+    .unwrap_or_else(|err: Error| err.to_compile_error_standalone())
+}

vendor/time-macros/src/offset.rs

@@ -0,0 +1,97 @@
+use std::iter::Peekable;
+
+use proc_macro::{Span, TokenStream, token_stream};
+use time_core::convert::*;
+
+use crate::Error;
+use crate::helpers::{consume_any_ident, consume_number, consume_punct};
+use crate::to_tokens::ToTokenStream;
+
+pub(crate) struct Offset {
+    pub(crate) hours: i8,
+    pub(crate) minutes: i8,
+    pub(crate) seconds: i8,
+}
+
+pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<Offset, Error> {
+    if consume_any_ident(&["utc", "UTC"], chars).is_ok() {
+        return Ok(Offset {
+            hours: 0,
+            minutes: 0,
+            seconds: 0,
+        });
+    }
+
+    let sign = if consume_punct('+', chars).is_ok() {
+        1
+    } else if consume_punct('-', chars).is_ok() {
+        -1
+    } else if let Some(tree) = chars.next() {
+        return Err(Error::UnexpectedToken { tree });
+    } else {
+        return Err(Error::MissingComponent {
+            name: "sign",
+            span_start: None,
+            span_end: None,
+        });
+    };
+
+    let (hours_span, hours) = consume_number::<i8>("hour", chars)?;
+    let (mut minutes_span, mut minutes) = (Span::mixed_site(), 0);
+    let (mut seconds_span, mut seconds) = (Span::mixed_site(), 0);
+
+    if consume_punct(':', chars).is_ok() {
+        let min = consume_number::<i8>("minute", chars)?;
+        minutes_span = min.0;
+        minutes = min.1;
+
+        if consume_punct(':', chars).is_ok() {
+            let sec = consume_number::<i8>("second", chars)?;
+            seconds_span = sec.0;
+            seconds = sec.1;
+        }
+    }
+
+    if hours > 25 {
+        Err(Error::InvalidComponent {
+            name: "hour",
+            value: hours.to_string(),
+            span_start: Some(hours_span.start()),
+            span_end: Some(hours_span.end()),
+        })
+    } else if minutes >= Minute::per_t(Hour) {
+        Err(Error::InvalidComponent {
+            name: "minute",
+            value: minutes.to_string(),
+            span_start: Some(minutes_span.start()),
+            span_end: Some(minutes_span.end()),
+        })
+    } else if seconds >= Second::per_t(Minute) {
+        Err(Error::InvalidComponent {
+            name: "second",
+            value: seconds.to_string(),
+            span_start: Some(seconds_span.start()),
+            span_end: Some(seconds_span.end()),
+        })
+    } else {
+        Ok(Offset {
+            hours: sign * hours,
+            minutes: sign * minutes,
+            seconds: sign * seconds,
+        })
+    }
+}
+
+impl ToTokenStream for Offset {
+    fn append_to(self, ts: &mut TokenStream) {
+        quote_append! { ts
+            unsafe {
+                ::time::UtcOffset::__from_hms_unchecked(
+                    #(self.hours),
+                    #(self.minutes),
+                    #(self.seconds),
+                )
+            }
+        }
+    }
+}

vendor/time-macros/src/quote.rs

@@ -0,0 +1,145 @@
+macro_rules! quote_ {
+    () => (proc_macro::TokenStream::new());
+    ($($x:tt)*) => {{
+        use proc_macro::*;
+        let mut ts = TokenStream::new();
+        let ts_mut = &mut ts;
+        quote_inner!(ts_mut $($x)*);
+        ts
+    }};
+}
+
+macro_rules! quote_append {
+    ($ts:ident $($x:tt)*) => {{
+        use proc_macro::*;
+        quote_inner!($ts $($x)*);
+    }};
+}
+
+macro_rules! quote_group {
+    ({ $($x:tt)* }) => {{
+        use proc_macro::*;
+        TokenTree::Group(Group::new(
+            Delimiter::Brace,
+            quote_!($($x)*)
+        ))
+    }};
+}
+
+macro_rules! sym {
+    ($ts:ident $x:tt $y:tt) => {
+        $ts.extend([
+            TokenTree::from(Punct::new($x, Spacing::Joint)),
+            TokenTree::from(Punct::new($y, Spacing::Alone)),
+        ]);
+    };
+    ($ts:ident $x:tt) => {
+        $ts.extend([TokenTree::from(Punct::new($x, Spacing::Alone))]);
+    };
+}
+
+#[allow(unused_macro_rules)] // Varies by feature flag combination.
+macro_rules! quote_inner {
+    // Base case
+    ($ts:ident) => {};
+
+    // Single or double symbols
+    ($ts:ident :: $($tail:tt)*) => { sym!($ts ':' ':'); quote_inner!($ts $($tail)*); };
+    ($ts:ident : $($tail:tt)*) => { sym!($ts ':'); quote_inner!($ts $($tail)*); };
+    ($ts:ident = $($tail:tt)*) => { sym!($ts '='); quote_inner!($ts $($tail)*); };
+    ($ts:ident ; $($tail:tt)*) => { sym!($ts ';'); quote_inner!($ts $($tail)*); };
+    ($ts:ident , $($tail:tt)*) => { sym!($ts ','); quote_inner!($ts $($tail)*); };
+    ($ts:ident . $($tail:tt)*) => { sym!($ts '.'); quote_inner!($ts $($tail)*); };
+    ($ts:ident & $($tail:tt)*) => { sym!($ts '&'); quote_inner!($ts $($tail)*); };
+    ($ts:ident < $($tail:tt)*) => { sym!($ts '<'); quote_inner!($ts $($tail)*); };
+    ($ts:ident >> $($tail:tt)*) => { sym!($ts '>' '>'); quote_inner!($ts $($tail)*); };
+    ($ts:ident > $($tail:tt)*) => { sym!($ts '>'); quote_inner!($ts $($tail)*); };
+    ($ts:ident -> $($tail:tt)*) => { sym!($ts '-' '>'); quote_inner!($ts $($tail)*); };
+    ($ts:ident ? $($tail:tt)*) => { sym!($ts '?'); quote_inner!($ts $($tail)*); };
+    ($ts:ident ! $($tail:tt)*) => { sym!($ts '!'); quote_inner!($ts $($tail)*); };
+    ($ts:ident | $($tail:tt)*) => { sym!($ts '|'); quote_inner!($ts $($tail)*); };
+    ($ts:ident * $($tail:tt)*) => { sym!($ts '*'); quote_inner!($ts $($tail)*); };
+    ($ts:ident + $($tail:tt)*) => { sym!($ts '+'); quote_inner!($ts $($tail)*); };
+
+    // Identifier
+    ($ts:ident $i:ident $($tail:tt)*) => {
+        $ts.extend([TokenTree::from(Ident::new(
+            &stringify!($i),
+            Span::mixed_site(),
+        ))]);
+        quote_inner!($ts $($tail)*);
+    };
+
+    // Literal
+    ($ts:ident 0 $($tail:tt)*) => {
+        $ts.extend([TokenTree::from(Literal::usize_unsuffixed(0))]);
+        quote_inner!($ts $($tail)*);
+    };
+    ($ts:ident $l:literal $($tail:tt)*) => {
+        $ts.extend([TokenTree::from(Literal::string(&$l))]);
+        quote_inner!($ts $($tail)*);
+    };
+
+    // Lifetime
+    ($ts:ident $l:lifetime $($tail:tt)*) => {
+        $ts.extend([
+            TokenTree::from(
+                Punct::new('\'', Spacing::Joint)
+            ),
+            TokenTree::from(Ident::new(
+                stringify!($l).trim_start_matches(|c| c == '\''),
+                Span::mixed_site(),
+            )),
+        ]);
+        quote_inner!($ts $($tail)*);
+    };
+
+    // Attribute
+    ($ts:ident #[$($inner:tt)*] $($tail:tt)*) => {
+        $ts.extend([
+            TokenTree::from(
+                Punct::new('#', Spacing::Alone)
+            ),
+            TokenTree::Group(Group::new(
+                Delimiter::Bracket,
+                quote_!($($inner)*)
+            )),
+        ]);
+        quote_inner!($ts $($tail)*);
+    };
+
+    // Groups
+    ($ts:ident ($($inner:tt)*) $($tail:tt)*) => {
+        $ts.extend([TokenTree::Group(Group::new(
+            Delimiter::Parenthesis,
+            quote_!($($inner)*)
+        ))]);
+        quote_inner!($ts $($tail)*);
+    };
+    ($ts:ident [$($inner:tt)*] $($tail:tt)*) => {
+        $ts.extend([TokenTree::Group(Group::new(
+            Delimiter::Bracket,
+            quote_!($($inner)*)
+        ))]);
+        quote_inner!($ts $($tail)*);
+    };
+    ($ts:ident {$($inner:tt)*} $($tail:tt)*) => {
+        $ts.extend([TokenTree::Group(Group::new(
+            Delimiter::Brace,
+            quote_!($($inner)*)
+        ))]);
+        quote_inner!($ts $($tail)*);
+    };
+
+    // Interpolated values
+    // TokenTree by default
+    ($ts:ident #($e:expr) $($tail:tt)*) => {
+        $ts.extend([$crate::to_tokens::ToTokenTree::into_token_tree($e)]);
+        quote_inner!($ts $($tail)*);
+    };
+    // Allow a TokenStream by request. It's more expensive, so avoid if possible.
+    ($ts:ident #S($e:expr) $($tail:tt)*) => {
+        $crate::to_tokens::ToTokenStream::append_to($e, $ts);
+        quote_inner!($ts $($tail)*);
+    };
+}

vendor/time-macros/src/serde_format_description.rs

@@ -0,0 +1,185 @@
+use proc_macro::{Ident, TokenStream, TokenTree};
+
+pub(crate) fn build(
+    visibility: TokenStream,
+    mod_name: Ident,
+    ty: TokenTree,
+    format: TokenStream,
+    format_description_display: String,
+) -> TokenStream {
+    let ty_s = &*ty.to_string();
+
+    let visitor = if cfg!(feature = "parsing") {
+        quote_! {
+            pub(super) struct Visitor;
+            pub(super) struct OptionVisitor;
+
+            impl<'a> ::serde::de::Visitor<'a> for Visitor {
+                type Value = __TimeSerdeType;
+
+                fn expecting(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
+                    write!(
+                        f,
+                        concat!(
+                            "a(n) `",
+                            #(ty_s),
+                            "` in the format \"{}\"",
+                        ),
+                        #(format_description_display.as_str())
+                    )
+                }
+
+                fn visit_str<E: ::serde::de::Error>(
+                    self,
+                    value: &str
+                ) -> Result<__TimeSerdeType, E> {
+                    __TimeSerdeType::parse(value, &description()).map_err(E::custom)
+                }
+            }
+
+            impl<'a> ::serde::de::Visitor<'a> for OptionVisitor {
+                type Value = Option<__TimeSerdeType>;
+
+                fn expecting(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
+                    write!(
+                        f,
+                        concat!(
+                            "an `Option<",
+                            #(ty_s),
+                            ">` in the format \"{}\"",
+                        ),
+                        #(format_description_display.as_str())
+                    )
+                }
+
+                fn visit_some<D: ::serde::de::Deserializer<'a>>(
+                    self,
+                    deserializer: D
+                ) -> Result<Option<__TimeSerdeType>, D::Error> {
+                    deserializer
+                        .deserialize_str(Visitor)
+                        .map(Some)
+                }
+
+                fn visit_none<E: ::serde::de::Error>(
+                    self
+                ) -> Result<Option<__TimeSerdeType>, E> {
+                    Ok(None)
+                }
+            }
+        }
+    } else {
+        quote_!()
+    };
+
+    let serialize_primary = if cfg!(feature = "formatting") {
+        quote_! {
+            pub fn serialize<S: ::serde::Serializer>(
+                datetime: &__TimeSerdeType,
+                serializer: S,
+            ) -> Result<S::Ok, S::Error> {
+                use ::serde::Serialize;
+                datetime
+                    .format(&description())
+                    .map_err(::time::error::Format::into_invalid_serde_value::<S>)?
+                    .serialize(serializer)
+            }
+        }
+    } else {
+        quote_!()
+    };
+
+    let deserialize_primary = if cfg!(feature = "parsing") {
+        quote_! {
+            pub fn deserialize<'a, D: ::serde::Deserializer<'a>>(
+                deserializer: D
+            ) -> Result<__TimeSerdeType, D::Error> {
+                use ::serde::Deserialize;
+                deserializer.deserialize_str(Visitor)
+            }
+        }
+    } else {
+        quote_!()
+    };
+
+    let serialize_option = if cfg!(feature = "formatting") {
+        quote_! {
+            #[expect(clippy::ref_option)]
+            pub fn serialize<S: ::serde::Serializer>(
+                option: &Option<__TimeSerdeType>,
+                serializer: S,
+            ) -> Result<S::Ok, S::Error> {
+                use ::serde::Serialize;
+                option.map(|datetime| datetime.format(&description()))
+                    .transpose()
+                    .map_err(::time::error::Format::into_invalid_serde_value::<S>)?
+                    .serialize(serializer)
+            }
+        }
+    } else {
+        quote_!()
+    };
+
+    let deserialize_option = if cfg!(feature = "parsing") {
+        quote_! {
+            pub fn deserialize<'a, D: ::serde::Deserializer<'a>>(
+                deserializer: D
+            ) -> Result<Option<__TimeSerdeType>, D::Error> {
+                use ::serde::Deserialize;
+                deserializer.deserialize_option(OptionVisitor)
+            }
+        }
+    } else {
+        quote_!()
+    };
+
+    let deserialize_option_imports = if cfg!(feature = "parsing") {
+        quote_! {
+            use super::__hygiene::{OptionVisitor, Visitor};
+        }
+    } else {
+        quote_!()
+    };
+
+    let fd_traits = match (cfg!(feature = "formatting"), cfg!(feature = "parsing")) {
+        (false, false) => {
+            bug!("serde_format_description::build called without formatting or parsing enabled")
+        }
+        (false, true) => quote_! { ::time::parsing::Parsable },
+        (true, false) => quote_! { ::time::formatting::Formattable },
+        (true, true) => quote_! { ::time::formatting::Formattable + ::time::parsing::Parsable },
+    };
+
+    quote_! {
+        #S(visibility) mod #(mod_name) {
+            use super::*;
+            // TODO Remove the prefix, forcing the user to import the type themself. This must be
+            // done in a breaking change.
+            use ::time::#(ty) as __TimeSerdeType;
+            #[expect(clippy::pub_use)]
+            pub use self::__hygiene::*;
+
+            const fn description() -> impl #S(fd_traits) {
+                #S(format)
+            }
+
+            mod __hygiene {
+                use super::{description, __TimeSerdeType};
+
+                #S(visitor)
+                #S(serialize_primary)
+                #S(deserialize_primary)
+            }
+
+            // While technically public, this is effectively the same visibility as the enclosing
+            // module, which has its visibility controlled by the user.
+            pub mod option {
+                use super::{description, __TimeSerdeType};
+                #S(deserialize_option_imports)
+
+                #S(serialize_option)
+                #S(deserialize_option)
+            }
+        }
+    }
+}

vendor/time-macros/src/time.rs

@@ -0,0 +1,120 @@
+use std::iter::Peekable;
+
+use proc_macro::{Span, TokenStream, token_stream};
+use time_core::convert::*;
+
+use crate::Error;
+use crate::helpers::{consume_any_ident, consume_number, consume_punct};
+use crate::to_tokens::ToTokenStream;
+
+enum Period {
+    Am,
+    Pm,
+    _24,
+}
+
+pub(crate) struct Time {
+    pub(crate) hour: u8,
+    pub(crate) minute: u8,
+    pub(crate) second: u8,
+    pub(crate) nanosecond: u32,
+}
+
+pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<Time, Error> {
+    fn consume_period(chars: &mut Peekable<token_stream::IntoIter>) -> (Option<Span>, Period) {
+        if let Ok(span) = consume_any_ident(&["am", "AM"], chars) {
+            (Some(span), Period::Am)
+        } else if let Ok(span) = consume_any_ident(&["pm", "PM"], chars) {
+            (Some(span), Period::Pm)
+        } else {
+            (None, Period::_24)
+        }
+    }
+
+    let (hour_span, hour) = consume_number("hour", chars)?;
+
+    let ((minute_span, minute), (second_span, second), (period_span, period)) =
+        match consume_period(chars) {
+            // Nothing but the 12-hour clock hour and AM/PM
+            (period_span @ Some(_), period) => (
+                (Span::mixed_site(), 0),
+                (Span::mixed_site(), 0.),
+                (period_span, period),
+            ),
+            (None, _) => {
+                consume_punct(':', chars)?;
+                let (minute_span, minute) = consume_number::<u8>("minute", chars)?;
+                let (second_span, second): (_, f64) = if consume_punct(':', chars).is_ok() {
+                    consume_number("second", chars)?
+                } else {
+                    (Span::mixed_site(), 0.)
+                };
+                let (period_span, period) = consume_period(chars);
+                (
+                    (minute_span, minute),
+                    (second_span, second),
+                    (period_span, period),
+                )
+            }
+        };
+
+    let hour = match (hour, period) {
+        (0, Period::Am | Period::Pm) => {
+            return Err(Error::InvalidComponent {
+                name: "hour",
+                value: hour.to_string(),
+                span_start: Some(hour_span.start()),
+                span_end: Some(period_span.unwrap_or_else(|| hour_span.end())),
+            });
+        }
+        (12, Period::Am) => 0,
+        (12, Period::Pm) => 12,
+        (hour, Period::Am | Period::_24) => hour,
+        (hour, Period::Pm) => hour + 12,
+    };
+
+    if hour >= Hour::per_t(Day) {
+        Err(Error::InvalidComponent {
+            name: "hour",
+            value: hour.to_string(),
+            span_start: Some(hour_span.start()),
+            span_end: Some(period_span.unwrap_or_else(|| hour_span.end())),
+        })
+    } else if minute >= Minute::per_t(Hour) {
+        Err(Error::InvalidComponent {
+            name: "minute",
+            value: minute.to_string(),
+            span_start: Some(minute_span.start()),
+            span_end: Some(minute_span.end()),
+        })
+    } else if second >= Second::per_t(Minute) {
+        Err(Error::InvalidComponent {
+            name: "second",
+            value: second.to_string(),
+            span_start: Some(second_span.start()),
+            span_end: Some(second_span.end()),
+        })
+    } else {
+        Ok(Time {
+            hour,
+            minute,
+            second: second.trunc() as u8,
+            nanosecond: (second.fract() * Nanosecond::per_t::<f64>(Second)).round() as u32,
+        })
+    }
+}
+
+impl ToTokenStream for Time {
+    fn append_to(self, ts: &mut TokenStream) {
+        quote_append! { ts
+            unsafe {
+                ::time::Time::__from_hms_nanos_unchecked(
+                    #(self.hour),
+                    #(self.minute),
+                    #(self.second),
+                    #(self.nanosecond),
+                )
+            }
+        }
+    }
+}

vendor/time-macros/src/to_tokens.rs

@@ -0,0 +1,84 @@
+use std::num::NonZero;
+
+use proc_macro::{Group, Ident, Literal, Punct, Span, TokenStream, TokenTree};
+
+/// Turn a type into a [`TokenStream`].
+pub(crate) trait ToTokenStream: Sized {
+    fn append_to(self, ts: &mut TokenStream);
+    fn into_token_stream(self) -> TokenStream {
+        let mut ts = TokenStream::new();
+        self.append_to(&mut ts);
+        ts
+    }
+}
+
+pub(crate) trait ToTokenTree: Sized {
+    fn into_token_tree(self) -> TokenTree;
+}
+
+impl<T: ToTokenTree> ToTokenStream for T {
+    fn append_to(self, ts: &mut TokenStream) {
+        ts.extend([self.into_token_tree()])
+    }
+}
+
+impl ToTokenTree for bool {
+    fn into_token_tree(self) -> TokenTree {
+        let lit = if self { "true" } else { "false" };
+        TokenTree::Ident(Ident::new(lit, Span::mixed_site()))
+    }
+}
+
+impl ToTokenStream for TokenStream {
+    fn append_to(self, ts: &mut TokenStream) {
+        ts.extend(self)
+    }
+}
+
+impl ToTokenTree for TokenTree {
+    fn into_token_tree(self) -> TokenTree {
+        self
+    }
+}
+
+impl ToTokenTree for &str {
+    fn into_token_tree(self) -> TokenTree {
+        TokenTree::Literal(Literal::string(self))
+    }
+}
+
+impl ToTokenTree for NonZero<u16> {
+    fn into_token_tree(self) -> TokenTree {
+        quote_group! {{
+            unsafe { ::core::num::NonZero::<u16>::new_unchecked(#(self.get())) }
+        }}
+    }
+}
+
+macro_rules! impl_for_tree_types {
+    ($($type:ty)*) => {$(
+        impl ToTokenTree for $type {
+            fn into_token_tree(self) -> TokenTree {
+                TokenTree::from(self)
+            }
+        }
+    )*};
+}
+impl_for_tree_types![Ident Literal Group Punct];
+
+macro_rules! impl_for_int {
+    ($($type:ty => $method:ident)*) => {$(
+        impl ToTokenTree for $type {
+            fn into_token_tree(self) -> TokenTree {
+                TokenTree::from(Literal::$method(self))
+            }
+        }
+    )*};
+}
+impl_for_int! {
+    i8 => i8_unsuffixed
+    u8 => u8_unsuffixed
+    u16 => u16_unsuffixed
+    i32 => i32_unsuffixed
+    u32 => u32_unsuffixed
+}

vendor/time-macros/src/utc_datetime.rs

@@ -0,0 +1,38 @@
+use std::iter::Peekable;
+
+use proc_macro::{TokenStream, token_stream};
+
+use crate::date::Date;
+use crate::error::Error;
+use crate::time::Time;
+use crate::to_tokens::ToTokenStream;
+use crate::{date, time};
+
+pub(crate) struct UtcDateTime {
+    date: Date,
+    time: Time,
+}
+
+pub(crate) fn parse(chars: &mut Peekable<token_stream::IntoIter>) -> Result<UtcDateTime, Error> {
+    let date = date::parse(chars)?;
+    let time = time::parse(chars)?;
+
+    if let Some(token) = chars.peek() {
+        return Err(Error::UnexpectedToken {
+            tree: token.clone(),
+        });
+    }
+
+    Ok(UtcDateTime { date, time })
+}
+
+impl ToTokenStream for UtcDateTime {
+    fn append_to(self, ts: &mut TokenStream) {
+        quote_append! { ts
+            ::time::UtcDateTime::new(
+                #S(self.date),
+                #S(self.time),
+            )
+        }
+    }
+}