Unfortunately the introduction of the iana-time-zone dependency in 0.4.21 caused some new regressions with lesser known platforms. This release fixes all of the issues we've encountered, improving the situation on some WebAssembly targets, SGX and on macOS/iOS. We've improved our CI setup to hopefully catch more of these issues before release in the future.
Make wasm-bindgen optional on wasm32-unknown-unknown target (#771)
Avoid iana-time-zone dependency on x86_64-fortanix-unknown-sgx (#767, thanks to @trevor-crypto)
Update iana-time-zone version to 0.1.44 to avoid cyclic dependencies (#773, thanks to @Kijewski for the upstream PRs)
Clarify documentation about year range in formatting/parsing (#765)
0.4.21 is a bugfix release that mainly fixes one regression from 0.4.20:
Fall back to UTC in case no timezone is found. Unfortunately this is a regression from the changes we made in 0.4.20 where we now parse the timezone database ourselves. Before 0.4.20, TimeZone::now() fell back to UTC in the case it could not find the current timezone, but the new implementation panicked in that case.
Correctly detect timezone on Android (also #756). Android does have the timezone database installed, but it's in a different path, and it does not use /etc/localtime to keep track of the current timezone. Instead we now use the iana-time-zone crate as a dependency, since it already has quite a bit of logic for finding the current timezone on a host of platforms.
Additionally, there is a documentation fix that reverts an incorrect guarantee:
Document that %Y can have a negative value, both in formatting and in parsing (#760, thanks to @alex)
0.4.20
chrono is a date and time library for Rust and 0.4.20 is the first chrono release since Sep 2020. There has been a long hiatus since the previous maintainer was no longer able to spend much time on the crate; thanks to @quodlibetor for their stewardship of the chrono crate for many years! The new maintainers are @djc and @esheppa. Our first priority has been fixing the soundness issues with calls to localtime_r() as first reported in #499 and the RUSTSEC-2020-0159 advisory. In order to do this we adapted code from the tz-rs crate maintained by @x-hgg-x for use within chrono -- thanks for working on that! With the new implementation, chrono uses safe Rust code to parse the timezone data files on Unix platforms directly instead of relying on libc.
Due to compatibility reasons, this release does not yet remove the time 0.1 dependency, though chrono 0.4.20 does not depend on the vulnerable parts of the time 0.1.x versions. In a future 0.5 release, we will remove the time dependency.
The minimum supported Rust version for 0.4.20 is 1.32.0, which is intentionally still quite conservative. If you are using chrono 0.4 with a Rust version older than 1.52, we'd like to hear from you since we'd like to further modernize the code base to ease maintenance.
Fixes
Fix unsound call to localtime_r() by parsing timezone files in Rust on Unix (#677 and #728)
Allow RFC 2822 parser to deal with comments (#733 then #737, thanks to @Finomnis)
Avoid panicking during parsing (#686, thanks to @botahamec)
Avoid panics when rounding durations (#659, thanks to @ARBaart)
Fix Duration::abs() behavior in case of negative durations with nanoseconds (#734, thanks to @abreis)
Additions
Make ParserErrorKind public and available through ParseError::kind() (#588, thanks to @sbrocket)
Expose associated MIN and MAX const values in favor of free-standing consts (#726)
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Bumps chrono from 0.4.19 to 0.4.22.
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Changelog
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Commits
4514276
update changelogdb8bde3
Apply clippy suggestionsf6b575c
Bump version number to 0.4.22af69b90
Require iana-time-zone 0.1.4484f98e0
set fallback feature in iana-time-zone depedency511d368
Add sgx build to CIbee614a
Do not include iana-time-zone for sgxfe4bd22
allow optional wasmbindgen95223ee
format: be specific about support year range2d22e57
Bump version number to 0.4.21Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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