1 files changed, 77 insertions, 0 deletions
diff --git a/third_party/rust/time/src/serde/iso8601.rs b/third_party/rust/time/src/serde/iso8601.rs
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index 0000000000..75deb62f1a
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+++ b/third_party/rust/time/src/serde/iso8601.rs
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+//! Use the well-known [ISO 8601 format] when serializing and deserializing an [`OffsetDateTime`].
+//!
+//! Use this module in combination with serde's [`#[with]`][with] attribute.
+//!
+//! [ISO 8601 format]: https://www.iso.org/iso-8601-date-and-time-format.html
+//! [with]: https://serde.rs/field-attrs.html#with
+
+#[cfg(feature = "parsing")]
+use core::marker::PhantomData;
+
+#[cfg(feature = "formatting")]
+use serde::ser::Error as _;
+#[cfg(feature = "parsing")]
+use serde::Deserializer;
+#[cfg(feature = "formatting")]
+use serde::{Serialize, Serializer};
+
+#[cfg(feature = "parsing")]
+use super::Visitor;
+use crate::format_description::well_known::iso8601::{Config, EncodedConfig};
+use crate::format_description::well_known::Iso8601;
+use crate::OffsetDateTime;
+
+/// The configuration of ISO 8601 used for serde implementations.
+pub(crate) const SERDE_CONFIG: EncodedConfig =
+    Config::DEFAULT.set_year_is_six_digits(true).encode();
+
+/// Serialize an [`OffsetDateTime`] using the well-known ISO 8601 format.
+#[cfg(feature = "formatting")]
+pub fn serialize<S: Serializer>(
+    datetime: &OffsetDateTime,
+    serializer: S,
+) -> Result<S::Ok, S::Error> {
+    datetime
+        .format(&Iso8601::<SERDE_CONFIG>)
+        .map_err(S::Error::custom)?
+        .serialize(serializer)
+}
+
+/// Deserialize an [`OffsetDateTime`] from its ISO 8601 representation.
+#[cfg(feature = "parsing")]
+pub fn deserialize<'a, D: Deserializer<'a>>(deserializer: D) -> Result<OffsetDateTime, D::Error> {
+    deserializer.deserialize_any(Visitor::<Iso8601<SERDE_CONFIG>>(PhantomData))
+}
+
+/// Use the well-known ISO 8601 format when serializing and deserializing an
+/// [`Option<OffsetDateTime>`].
+///
+/// Use this module in combination with serde's [`#[with]`][with] attribute.
+///
+/// [ISO 8601 format]: https://www.iso.org/iso-8601-date-and-time-format.html
+/// [with]: https://serde.rs/field-attrs.html#with
+pub mod option {
+    #[allow(clippy::wildcard_imports)]
+    use super::*;
+
+    /// Serialize an [`Option<OffsetDateTime>`] using the well-known ISO 8601 format.
+    #[cfg(feature = "formatting")]
+    pub fn serialize<S: Serializer>(
+        option: &Option<OffsetDateTime>,
+        serializer: S,
+    ) -> Result<S::Ok, S::Error> {
+        option
+            .map(|odt| odt.format(&Iso8601::<SERDE_CONFIG>))
+            .transpose()
+            .map_err(S::Error::custom)?
+            .serialize(serializer)
+    }
+
+    /// Deserialize an [`Option<OffsetDateTime>`] from its ISO 8601 representation.
+    #[cfg(feature = "parsing")]
+    pub fn deserialize<'a, D: Deserializer<'a>>(
+        deserializer: D,
+    ) -> Result<Option<OffsetDateTime>, D::Error> {
+        deserializer.deserialize_option(Visitor::<Option<Iso8601<SERDE_CONFIG>>>(PhantomData))
+    }
+}