time/serde/timestamp/
milliseconds_i64.rs

1//! Treat an [`OffsetDateTime`] as a [Unix timestamp] with milliseconds for
2//! the purposes of serde.
3//!
4//! Use this module in combination with serde's [`#[with]`][with] attribute.
5//!
6//! When deserializing, the offset is assumed to be UTC.
7//!
8//! [Unix timestamp]: https://en.wikipedia.org/wiki/Unix_time
9//! [with]: https://serde.rs/field-attrs.html#with
10
11use num_conv::prelude::*;
12use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
13
14use crate::OffsetDateTime;
15
16/// Serialize an `OffsetDateTime` as its Unix timestamp with milliseconds
17pub fn serialize<S: Serializer>(
18    datetime: &OffsetDateTime,
19    serializer: S,
20) -> Result<S::Ok, S::Error> {
21    let timestamp = (datetime.unix_timestamp_nanos() / 1_000_000).truncate::<i64>();
22    timestamp.serialize(serializer)
23}
24
25/// Deserialize an `OffsetDateTime` from its Unix timestamp with milliseconds
26pub fn deserialize<'a, D: Deserializer<'a>>(deserializer: D) -> Result<OffsetDateTime, D::Error> {
27    let value: i64 = <_>::deserialize(deserializer)?;
28    OffsetDateTime::from_unix_timestamp_nanos(value.extend::<i128>() * 1_000_000)
29        .map_err(|err| de::Error::invalid_value(de::Unexpected::Signed(err.value), &err))
30}
31
32/// Treat an `Option<OffsetDateTime>` as a [Unix timestamp] with milliseconds
33/// for the purposes of serde.
34///
35/// Use this module in combination with serde's [`#[with]`][with] attribute.
36///
37/// When deserializing, the offset is assumed to be UTC.
38///
39/// [Unix timestamp]: https://en.wikipedia.org/wiki/Unix_time
40/// [with]: https://serde.rs/field-attrs.html#with
41pub mod option {
42    #[allow(clippy::wildcard_imports)]
43    use super::*;
44
45    /// Serialize an `Option<OffsetDateTime>` as its Unix timestamp with milliseconds
46    pub fn serialize<S: Serializer>(
47        option: &Option<OffsetDateTime>,
48        serializer: S,
49    ) -> Result<S::Ok, S::Error> {
50        option
51            .map(|timestamp| (timestamp.unix_timestamp_nanos() / 1_000_000).truncate::<i64>())
52            .serialize(serializer)
53    }
54
55    /// Deserialize an `Option<OffsetDateTime>` from its Unix timestamp with milliseconds
56    pub fn deserialize<'a, D: Deserializer<'a>>(
57        deserializer: D,
58    ) -> Result<Option<OffsetDateTime>, D::Error> {
59        Option::deserialize(deserializer)?
60            .map(|value: i64| {
61                OffsetDateTime::from_unix_timestamp_nanos(value.extend::<i128>() * 1_000_000)
62            })
63            .transpose()
64            .map_err(|err| de::Error::invalid_value(de::Unexpected::Signed(err.value), &err))
65    }
66}
time/serde/timestamp/milliseconds_i64.rs

time/serde/timestamp/
milliseconds_i64.rs
