chore: checkpoint before Python removal

vendor/headers/src/common/date.rs

@@ -0,0 +1,46 @@
+use std::time::SystemTime;
+
+use crate::util::HttpDate;
+
+/// `Date` header, defined in [RFC7231](https://datatracker.ietf.org/doc/html/rfc7231#section-7.1.1.2)
+///
+/// The `Date` header field represents the date and time at which the
+/// message was originated.
+///
+/// ## ABNF
+///
+/// ```text
+/// Date = HTTP-date
+/// ```
+///
+/// ## Example values
+///
+/// * `Tue, 15 Nov 1994 08:12:31 GMT`
+///
+/// # Example
+///
+/// ```
+/// use headers::Date;
+/// use std::time::SystemTime;
+///
+/// let date = Date::from(SystemTime::now());
+/// ```
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Date(HttpDate);
+
+derive_header! {
+    Date(_),
+    name: DATE
+}
+
+impl From<SystemTime> for Date {
+    fn from(time: SystemTime) -> Date {
+        Date(time.into())
+    }
+}
+
+impl From<Date> for SystemTime {
+    fn from(date: Date) -> SystemTime {
+        date.0.into()
+    }
+}