Sourced from chrono's releases.

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!

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)

... (truncated)

• 352a352 Prepare 0.4.38
• 46d44d6 Manually implement Copy for DateTime if offset is Copy
• 760eb66 Update windows-bindgen requirement from 0.55 to 0.56
• 391187f Return error when rounding with zero duration
• ffc75e5 Add TimeDelta::checked_mul and TimeDelta::checked_div
• f8cecbe Make Weekday::num_days_from public, rename to days_since.
• 0cfc405 Optimize number formatting
• 74ba83b Take pad by value
• 78e79db Match on tuples in format_fixed
• f3d76c7 Match on tuples in format_numeric
• Additional commits viewable in compare view

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