ChangeLog for Chrono
====================
This documents all notable changes to [Chrono](https://github.com/lifthrasiir/rust-chrono).
Chrono obeys the principle of [Semantic Versioning](http://semver.org/).
There were/are numerous minor versions before 1.0 due to the language changes.
Versions with only mechnical changes will be omitted from the following list.
## 0.2.18 (2016-01-23)
### Fixed
- Chrono no longer pulls a superfluous `rand` dependency. (#57)
## 0.2.17 (2015-11-22)
### Added
- Naive date and time types and `DateTime` now have a `serde` support.
They serialize as an ISO 8601 / RFC 3339 string just like `Debug`. (#51)
## 0.2.16 (2015-09-06)
### Added
- Added `%.3f`, `%.6f` and `%.9f` specifier for formatting fractional seconds
up to 3, 6 or 9 decimal digits. This is a natural extension to the existing `%f`.
Note that this is (not yet) generic, no other value of precision is supported. (#45)
### Changed
- Forbade unsized types from implementing `Datelike` and `Timelike`.
This does not make a big harm as any type implementing them should be already sized
to be practical, but this change still can break highly generic codes. (#46)
### Fixed
- Fixed a broken link in the `README.md`. (#41)
## 0.2.15 (2015-07-05)
### Added
- Padding modifiers `%_?`, `%-?` and `%0?` are implemented.
They are glibc extensions which seem to be reasonably widespread (e.g. Ruby).
- Added `%:z` specifier and corresponding formatting items
which is essentially same to `%z` but with a colon.
- Added a new specifier `%.f` which precision adapts from the input.
This was added as a response to the UX problems in the original nanosecond specifier `%f`.
### Fixed
- `Numeric::Timestamp` specifier (`%s`) was ignoring the time zone offset when provided.
- Improved the documentation and associated tests for `strftime`.
## 0.2.14 (2015-05-15)
### Fixed
- `NaiveDateTime +/- Duration` or `NaiveTime +/- Duration` could have gone wrong
when the `Duration` to be added is negative and has a fractional second part.
This was caused by an underflow in the conversion from `Duration` to the parts;
the lack of tests for this case allowed a bug. (#37)
## 0.2.13 (2015-04-29)
### Added
- The optional dependency on `rustc_serialize` and
relevant `Rustc{En,De}codable` implementations for supported types has been added.
This is enabled by the `rustc-serialize` Cargo feature. (#34)
### Changed
- `chrono::Duration` reexport is changed to that of crates.io `time` crate.
This enables Rust 1.0 beta compatibility.
## 0.2.4 (2015-03-03)
### Fixed
- Clarified the meaning of `Date<Tz>` and fixed unwanted conversion problem
that only occurs with positive UTC offsets. (#27)
## 0.2.3 (2015-02-27)
### Added
- `DateTime<Tz>` and `Date<Tz>` is now `Copy`/`Send` when `Tz::Offset` is `Copy`/`Send`.
The implementations for them were mistakenly omitted. (#25)
### Fixed
- `Local::from_utc_datetime` didn't set a correct offset. (#26)
## 0.2.1 (2015-02-21)
### Changed
- `DelayedFormat` no longer conveys a redundant lifetime.
## 0.2.0 (2015-02-19)
### Added
- `Offset` is splitted into `TimeZone` (constructor) and `Offset` (storage) types.
You would normally see only the former, as the latter is mostly an implementation detail.
Most importantly, `Local` now can be used to directly construct timezone-aware values.
Some types (currently, `UTC` and `FixedOffset`) are both `TimeZone` and `Offset`,
but others aren't (e.g. `Local` is not what is being stored to each `DateTime` values).
- `LocalResult::map` convenience method has been added.
- `TimeZone` now allows a construction of `DateTime` values from UNIX timestamp,
via `timestamp` and `timestamp_opt` methods.
- `TimeZone` now also has a method for parsing `DateTime`, namely `datetime_from_str`.
- The following methods have been added to all date and time types:
- `checked_add`
- `checked_sub`
- `format_with_items`
- The following methods have been added to all timezone-aware types:
- `timezone`
- `with_timezone`
- `naive_utc`
- `naive_local`
- `parse_from_str` method has been added to all naive types and `DateTime<FixedOffset>`.
- All naive types and instances of `DateTime` with time zones `UTC`, `Local` and `FixedOffset`
implement the `FromStr` trait. They parse what `std::fmt::Debug` would print.
- `chrono::format` has been greatly rewritten.
- The formatting syntax parser is modular now, available at `chrono::format::strftime`.
- The parser and resolution algorithm is also modular, the former is available at
`chrono::format::parse` while the latter is available at `chrono::format::parsed`.
- Explicit support for RFC 2822 and 3339 syntaxes is landed.
- There is a minor formatting difference with atypical values,
e.g. for years not between 1 BCE and 9999 CE.
### Changed
- Most uses of `Offset` are converted to `TimeZone`.
In fact, *all* user-facing code is expected to be `Offset`-free.
- `[Naive]DateTime::*num_seconds_from_unix_epoch*` methods have been renamed to
simply `timestamp` or `from_timestamp*`. The original names have been deprecated.
### Removed
- `Time` has been removed. This also prompts a related set of methods in `TimeZone`.
This is in principle possible, but in practice has seen a little use
because it can only be meaningfully constructed via an existing `DateTime` value.
This made many operations to `Time` unintuitive or ambiguous,
so we simply let it go.
In the case that `Time` is really required, one can use a simpler `NaiveTime`.
`NaiveTime` and `NaiveDate` can be freely combined and splitted,
and `TimeZone::from_{local,utc}_datetime` can be used to convert from/to the local time.
- `with_offset` method has been removed. Use `with_timezone` method instead.
(This is not deprecated since it is an integral part of offset reform.)
## 0.1.14 (2015-01-10)
### Added
- Added a missing `std::fmt::String` impl for `Local`.
## 0.1.13 (2015-01-10)
### Changed
- Most types now implement both `std::fmt::Show` and `std::fmt::String`,
with the former used for the stricter output and the latter used for more casual output.
### Removed
- `Offset::name` has been replaced by a `std::fmt::String` implementation to `Offset`.
## 0.1.12 (2015-01-08)
### Removed
- `Duration + T` no longer works due to the updated impl reachability rules.
Use `T + Duration` as a workaround.
## 0.1.4 (2014-12-13)
### Fixed
- Fixed a bug that `Date::and_*` methods with an offset that can change the date are
off by one day.
## 0.1.3 (2014-11-28)
### Added
- `{Date,Time,DateTime}::with_offset` methods have been added.
- `LocalResult` now implements a common set of traits.
- `LocalResult::and_*` methods have been added.
They are useful for safely chaining `LocalResult<Date<Off>>` methods
to make `LocalResult<DateTime<Off>>`.
### Changed
- `Offset::name` now returns `SendStr`.
- `{Date,Time} - Duration` overloadings are now allowed.
## 0.1.2 (2014-11-24)
### Added
- `Duration + Date` overloading is now allowed.
### Changed
- Chrono no longer needs `num` dependency.
## 0.1.0 (2014-11-20)
The initial version that was available to `crates.io`.