0.4.42

What's Changed

• Add fuzzer for DateTime::parse_from_str by @tyler92 in #1700
• Fix wrong amount of micro/milliseconds by @nmlt in #1703
• Add warning about MappedLocalTime and wasm by @lutzky in #1702
• Fix incorrect parsing of fixed-length second fractions by @chris-leach in #1705
• Fix cfgs for wasm32-linux support by @arjunr2 in #1707
• Fix OpenHarmony's tzdata parsing by @ldm0 in #1679
• Convert NaiveDate to/from days since unix epoch by @findepi in #1715
• Add ?Sized bound to related methods of DelayedFormat::write_to by @Huliiiiii in #1721
• Add from_timestamp_secs method to DateTime by @jasonaowen in #1719
• Migrate to core::error::Error by @benbrittain in #1704
• Upgrade to windows-bindgen 0.63 by @djc in #1730
• strftime: simplify error handling by @djc in #1731

v0.4.41

What's Changed

• Add subsec_micros and subsec_millis methods to TimeDelta by @ggoetz in #1668
• Deprecate NaiveDateTime::UNIX_EPOCH by @robertbastian in #1670
• Implement as_seconds_f32 and as_seconds_f64 for TimeDelta by @ggoetz in #1671
• chore: fix some comments by @jimmycathy in #1677
• Add num_days_in_month method to Datelike trait by @aslilac in #1673
• add WeekdaySet, a collection of Weekday that is Copy by @Kinrany in #1676
• WeekdaySet tweaks by @djc in #1680
• Upgrade to windows-bindgen 0.61 by @djc in #1682
• Implemented a consistent Eq trait for NaiveWeek by @Splashling1789 in #1687
• TimeZone::from_posix_tz: Treat empty TZ variable as UTC by @drinkcat in #1691
• Add support for lossy format strings by @Qelxiros in #1693

0.4.40

What's Changed

• Add Month::num_days() by @djc in #1645
• Update Windows dependencies by @kennykerr in #1646
• Feature/round_up method on DurationRound trait by @MagnumTrader in #1651
• Expose write_to for DelayedFormat by @tugtugtug in #1654
• Update LICENSE.txt by @maximevtush in #1656
• docs: fix minor typo by @samfolo in #1659
• Use NaiveDateTime for internal tz_info methods. by @AVee in #1658
• Upgrade to windows-bindgen 0.60 by @djc in #1665
• Add quarter (%q) date string specifier by @drinkcat in #1666

0.4.39

What's Changed

• #1577: Changed years_since documentation to match its implementation by @Taxalo in #1578
• Remove obsolete weird feature guard by @djc in #1582
• Fix format::strftime docs link by @frederikhors in #1581
• Fix micros (optional) limit in and_hms_micro_opt by @qrilka in #1584
• Update windows-bindgen requirement from 0.56 to 0.57 by @dependabot in #1589
• native/date: Improve DelayedFormat doc re Panics by @behnam-oneschema in #1590
• Fix typo in rustdoc of from_timestamp_nanos() by @sgoll in #1591
• Update windows-bindgen requirement from 0.57 to 0.58 by @dependabot in #1594
• docs: document century cutoff for %y by @MarcoGorelli in #1598
• Checked NaiveWeek methods by @bragov4ik in #1600
• Impl serde::Serialize and serde::Deserialize for TimeDelta by @Awpteamoose in #1599
• Derive PartialEq,Eq,Hash,Copy and Clone on NaiveWeek by @DSeeLP in #1618
• Support ohos tzdata since ver.oh35 by @MirageLyu in #1613
• Use Formatter::pad (instead of write_str) for Weekdays by @horazont in #1621
• Fix typos by @szepeviktor in #1623
• Fix comment. by @khuey in #1624
• chore: add #[inline] to num_days by @CommanderStorm in #1627
• fix typo by @futreall in #1633
• Update mod.rs by @donatik27 in #1638

v0.4.38

This release bring a ca. 20% improvement to the performance of the formatting code, and a convenient days_since method for the Weekday type.

Chrono 0.4.38 also removes the long deprecated rustc-serialize feature. Support for rustc-serialize will be soft-destabilized in the next Rust edition. Removing the feature will not break existing users of the feature; Cargo will just not update dependents that rely on it to newer versions of chrono.

In chrono 0.4.36 we made an accidental breaking change by switching to derive(Copy) for DateTime instead of a manual implementation. It is reverted in this release.

Removals

• Remove rustc-serialize feature (#1548, thanks @workingjubilee)

Additions

• Add Weekday::days_since (#1249, based on #216 by @clarfonthey)
• Add TimeDelta::checked_mul and TimeDelta::checked_div (#1565, thanks @Zomtir)

Fixes

• Return error when rounding with a zero duration (#1474, thanks @Dav1dde)
• Manually implement Copy for DateTime if offset is Copy (#1573)

Internal

• Inline test_encodable_json and test_decodable_json functions (#1550)
• CI: Reduce combinations in cargo hack check (#1553)
• Refactor formatting code (#1335)
• Optimize number formatting (#1558)
• Only package files needed for building and testing (#1554)

Thanks to all contributors on behalf of the chrono team, @djc and @pitdicker!

v.0.4.8

Fixes

• Add '0' to single-digit days in rfc2822 date format (@wyhaya #323)
• Correctly pad DelayedFormat (@SamokhinIlya #320)

Features

• Support wasm-unknown-unknown via wasm-bindgen (in addition to emscripten/wasm-unknown-emscripten). (finished by @evq in #331, initial work by @jjpe #287)

v0.4.37

Version 0.4.36 introduced an unexpected breaking change and was yanked. In it LocalResult was renamed to MappedLocalTime to avoid the impression that it is a Result type were some of the results are errors. For backwards compatibility a type alias with the old name was added.

As it turns out there is one case where a type alias behaves differently from the regular enum: you can't import enum variants from a type alias with use chrono::LocalResult::*. With 0.4.37 we make the new name MappedLocalTime the alias, but keep using it in function signatures and the documentation as much as possible.

See also the release notes of chrono 0.4.36 from yesterday for the yanked release.

v0.4.36

This release un-deprecates the methods on TimeDelta that were deprecated with the 0.4.35 release because of the churn they are causing for the ecosystem.

New is the DateTime::with_time() method. As an example of when it is useful:

use chrono::{Local, NaiveTime};
// Today at 12:00:00
let today_noon = Local::now().with_time(NaiveTime::from_hms_opt(12, 0, 0).unwrap());

Additions

• Add DateTime::with_time() (#1510)

Deprecations

• Revert TimeDelta deprecations (#1543)
• Deprecate TimeStamp::timestamp_subsec_nanos, which was missed in the 0.4.35 release (#1486)

Documentation

• Correct version number of deprecation notices (#1486)
• Fix some typos (#1505)
• Slightly improve serde documentation (#1519)
• Main documentation: simplify links and reflow text (#1535)

Internal

• CI: Lint benchmarks (#1489)
• Remove unnessary Copy and Send impls (#1492, thanks @erickt)
• Backport streamlined NaiveDate unit tests (#1500, thanks @Zomtir)
• Rename LocalResult to TzResolution, add alias (#1501)
• Update windows-bindgen to 0.55 (#1504)
• Avoid duplicate imports, which generate warnings on nightly (#1507)
• Add extra debug assertions to NaiveDate::from_yof (#1518)
• Some small simplifications to DateTime::date_naive and NaiveDate::diff_months (#1530)
• Remove unwrap in Unix Local type (#1533)
• Use different method to ignore feature-dependent doctests (#1534)

Thanks to all contributors on behalf of the chrono team, @djc and @pitdicker!

v0.4.35

Most of our efforts have shifted to improving the API for a 0.5 release, for which cleanups and refactorings are landing on the 0.4.x branch.

The most significant changes in this release are two sets of deprecations.

• We deprecated all timestamp-related methods on NaiveDateTime. The reason is that a timestamp is defined to be in UTC. The NaiveDateTime type doesn't know the offset from UTC, so it was technically wrong to have these methods. The alternative is to use the similar methods on the DateTime<Utc> type, or from the TimeZone trait.

  Converting from NaiveDateTime to DateTime<Utc> is simple with .and_utc(), and in the other direction with .naive_utc().

• The panicking constructors of TimeDelta (the new name of the Duration type) are deprecated. This was the last part of chrono that defaulted to panicking on error, dating from before rust 1.0.

• A nice change is that NaiveDate now includes a niche. So now Option<NaiveDate>, Option<NaiveDateTime> and Option<DateTime<Tz>> are the same size as their base types.

• format::Numeric and format::Fixed are marked as non_exhaustive. This will allow us to improve our formatting and parsing support, and we have reason to believe this breaking change will have little to no impact on users.

Additions

• Add DateTime::{from_timestamp_micros, from_timestamp_nanos} (#1234)
• Add getters to Parsed (#1465)

Deprecations

• Deprecate timestamp methods on NaiveDateTime (#1473)
• Deprecate panicking constructors of TimeDelta (#1450)

Changes/fixes

• Use NonZeroI32 inside NaiveDate (#1207)
• Mark format::Numeric and format::Fixed as non_exhaustive (#1430)
• Parsed fixes to error values (#1439)
• Use overflowing_naive_local in DateTime::checked_add* (#1333)
• Do complete range checks in Parsed::set_* (#1465)

Documentation

• Rustfmt doctests (#1452)
• Improve docs for crate features (#1455, thanks @edmorley)
• Add more documentation and examples to Parsed (#1439)

Internal

• Refactor internals module (#1428, #1429, #1431, #1432, #1433, #1438)
• CI: test cross-compiling to x86_64-unknown-illumos instead of Solaris (#1437)
• CI: lint Windows target, fix clippy warning (#1441)
• CI: only run cargo hack check on Linux (#1442)
• Update windows-bindgen to 0.54 (#1462, #1483)
• Simplify error value of parse_internal (#1459)
• Simplify SerdeError (#1458)
• Simplify NaiveDate::from_isoywd a bit (#1464)

Thanks to all contributors on behalf of the chrono team, @djc and @pitdicker!

v0.4.34

Notable changes

• In chrono 0.4.34 we finished the work to make all methods const where doing so is supported by rust 1.61.
• We renamed the Duration type to TimeDelta. This removes the confusion between chrono's type and the later Duration type in the standard library. It will remain available under the old name as a type alias for compatibility.
• The Windows implementation of Local is rewritten. The new version avoids panics when the date is outside of the range supported by windows (the years 1601 to 30828), and gives more accurate results during DST transitions.
• The Display format of TimeDelta is modified to conform better to ISO 8601. Previously it converted all values greater than 24 hours to a value with days. This is not correct, as doing so changes the duration from an 'accurate' to a 'nominal' representation to use ISO 8601 terms.

Fixes

• Add missing range check in TimeDelta::milliseconds (#1385, thanks @danwilliams)
• Remove check for DurationExceedsTimestamp in DurationRound (#1403, thanks @joroKr21)
• Fix localized formatting with %X (chronotope/pure-rust-locales#12, #1420)
• Windows: base implementation on GetTimeZoneInformationForYear (#1017)

Additions

• Add TimeDelta::try_milliseconds (#1385, thanks @danwilliams)
• Add TimeDelta::new (#1337)
• Add StrftimeItems::{parse, parse_to_owned} and more documentation (#1184)
• More standard traits and documentation for format::Locale (via chronotope/pure-rust-locales#8)

Changes

• Rename Duration to TimeDelta, add type alias (#1406)
• Make TimeDelta methods const (#1337)
• Make remaining methods of NaiveDate, NaiveWeek, NaiveTime and NaiveDateTime const where possible (#1337)
• Make methods on DateTime const where possible (#1400)
• Make Display format of TimeDelta conform better to ISO 8601 (#1328)

Documentation

• Fix the formatting of timestamp_micros's Example doc (#1338 via #1386, thanks @emikitas)
• Specify branch for GitHub Actions badge and fix link (#1388)
• Don't mention some deprecated methods in docs (#1395)
• Remove stray documentation from main (#1397)
• Improved documentation of TimeDelta constructors (#1385, thanks @danwilliams)

Internal

• Switch branch names: 0.4.x releases are the main branch, work on 0.5 happens in the 0.5.x branch (#1390, #1402).
• Don't use deprecated method in impl Arbitrary for DateTime and set up CI test (#1336)
• Remove workaround for Rust < 1.61 (#1393)
• Bump codecov/codecov-action from 3 to 4 (#1404)
• Remove partial support for handling -0000 offset (#1411)
• Move TOO_LONG error out of parse_internal (#1419)

Thanks to all contributors on behalf of the chrono team, @djc and @pitdicker!