add optional rkyv support

CHANGELOG.md

@@ -21,6 +21,7 @@ Versions with only mechanical changes will be omitted from the following list.
 * Correct build for wasm32-unknown-emscripten target (#568)
 * Change `Local::now()` and `Utc::now()` documentation from "current date" to "current date and time" (#647)
 * Fix `duration_round` panic on rounding by `Duration::zero()` (#658)
+* Add optional rkyv support.
 
 ## 0.4.19
 

Cargo.toml

@@ -39,6 +39,7 @@ rustc-serialize = { version = "0.3.20", optional = true }
 serde = { version = "1.0.99", default-features = false, optional = true }
 pure-rust-locales = { version = "0.5.2", optional = true }
 criterion = { version = "0.3", optional = true }
+rkyv = {version = "0.7", optional = true}
 
 [target.'cfg(all(target_arch = "wasm32", not(any(target_os = "emscripten", target_os = "wasi"))))'.dependencies]
 wasm-bindgen = { version = "0.2", optional = true }

src/date.rs

@@ -18,7 +18,8 @@ use crate::naive::{self, IsoWeek, NaiveDate, NaiveTime};
 use crate::offset::{TimeZone, Utc};
 use crate::DateTime;
 use crate::{Datelike, Weekday};
-
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 /// ISO 8601 calendar date with time zone.
 ///
 /// You almost certainly want to be using a [`NaiveDate`] instead of this type.
@@ -51,6 +52,7 @@ use crate::{Datelike, Weekday};
 ///   so the local date and UTC date should be equal for most cases
 ///   even though the raw calculation between `NaiveDate` and `Duration` may not.
 #[derive(Clone)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct Date<Tz: TimeZone> {
     date: NaiveDate,
     offset: Tz::Offset,

src/naive/date.rs

@@ -17,6 +17,8 @@ use crate::format::{parse, ParseError, ParseResult, Parsed, StrftimeItems};
 use crate::format::{Item, Numeric, Pad};
 use crate::naive::{IsoWeek, NaiveDateTime, NaiveTime};
 use crate::{Datelike, Weekday};
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 
 use super::internals::{self, DateImpl, Mdf, Of, YearFlags};
 use super::isoweek;
@@ -96,6 +98,7 @@ const MAX_BITS: usize = 44;
 ///
 /// This is currently the internal format of Chrono's date types.
 #[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Clone)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct NaiveDate {
     ymdf: DateImpl, // (year << 13) | of
 }

src/naive/datetime/mod.rs

@@ -20,6 +20,8 @@ use crate::naive::time::{MAX_TIME, MIN_TIME};
 use crate::naive::{IsoWeek, NaiveDate, NaiveTime};
 use crate::oldtime::Duration as OldDuration;
 use crate::{Datelike, Timelike, Weekday};
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 
 #[cfg(feature = "rustc-serialize")]
 pub(super) mod rustc_serialize;
@@ -70,6 +72,7 @@ pub const MAX_DATETIME: NaiveDateTime = NaiveDateTime { date: MAX_DATE, time: MA
 /// assert_eq!(dt.num_seconds_from_midnight(), 33011);
 /// ```
 #[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Clone)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct NaiveDateTime {
     date: NaiveDate,
     time: NaiveTime,

src/naive/time/mod.rs

@@ -15,6 +15,8 @@ use crate::format::{parse, ParseError, ParseResult, Parsed, StrftimeItems};
 use crate::format::{Fixed, Item, Numeric, Pad};
 use crate::oldtime::Duration as OldDuration;
 use crate::Timelike;
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 
 #[cfg(feature = "rustc-serialize")]
 mod rustc_serialize;
@@ -189,6 +191,7 @@ pub(super) const MAX_TIME: NaiveTime =
 /// Since Chrono alone cannot determine any existence of leap seconds,
 /// **there is absolutely no guarantee that the leap second read has actually happened**.
 #[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Clone)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct NaiveTime {
     secs: u32,
     frac: u32,

src/offset/fixed.rs

@@ -12,6 +12,8 @@ use crate::naive::{NaiveDate, NaiveDateTime, NaiveTime};
 use crate::oldtime::Duration as OldDuration;
 use crate::DateTime;
 use crate::Timelike;
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 
 /// The time zone with fixed offset, from UTC-23:59:59 to UTC+23:59:59.
 ///
@@ -20,6 +22,7 @@ use crate::Timelike;
 /// `DateTime<FixedOffset>` instances. See the [`east`](#method.east) and
 /// [`west`](#method.west) methods for examples.
 #[derive(PartialEq, Eq, Hash, Copy, Clone)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct FixedOffset {
     local_minus_utc: i32,
 }

src/offset/local.rs

@@ -14,6 +14,8 @@ use crate::naive::{NaiveDate, NaiveDateTime};
 use crate::{Date, DateTime};
 #[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"), feature = "wasmbind")))]
 use crate::{Datelike, Timelike};
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 
 /// Converts a `time::Tm` struct into the timezone-aware `DateTime`.
 /// This assumes that `time` is working correctly, i.e. any error is fatal.
@@ -88,6 +90,7 @@ fn datetime_to_timespec(d: &NaiveDateTime, local: bool) -> sys::Timespec {
 /// let dt: DateTime<Local> = Local.timestamp(0, 0);
 /// ```
 #[derive(Copy, Clone, Debug)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct Local;
 
 impl Local {

src/offset/utc.rs

@@ -9,6 +9,8 @@ use super::{FixedOffset, LocalResult, Offset, TimeZone};
 use crate::naive::{NaiveDate, NaiveDateTime};
 #[cfg(feature = "clock")]
 use crate::{Date, DateTime};
+#[cfg(feature = "rkyv")]
+use rkyv::{Archive, Deserialize, Serialize};
 #[cfg(all(
     feature = "clock",
     not(all(target_arch = "wasm32", not(target_os = "wasi"), feature = "wasmbind"))
@@ -33,6 +35,7 @@ use std::time::{SystemTime, UNIX_EPOCH};
 /// assert_eq!(Utc.ymd(1970, 1, 1).and_hms(0, 1, 1), dt);
 /// ```
 #[derive(Copy, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
 pub struct Utc;
 
 #[cfg(feature = "clock")]