date/README.md
2017-10-23 09:47:15 -04:00

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**[Try it out on wandbox!](https://wandbox.org/permlink/89NAwx7m3FtqFSJO)**
This is actually several separate C++11/C++14 libraries:
1. `"date.h"` is a header-only library which builds upon `<chrono>`. It adds some new `duration` types, and new `time_point` types. It also adds "field" types such as `year_month_day` which is a struct `{year, month, day}`. And it provides convenient means to convert between the "field" types and the `time_point` types.
* Documentation: http://howardhinnant.github.io/date/date.html
* Video: https://www.youtube.com/watch?v=tzyGjOm8AKo
* Slides: http://schd.ws/hosted_files/cppcon2015/43/hinnant_dates.pdf
2. `"tz.h"` / `"tz.cpp"` are a timezone library built on top of the `"date.h"` library. This timezone library is a complete parser of the IANA timezone database. It provides for an easy way to access all of the data in this database, using the types from `"date.h"` and `<chrono>`. The IANA database also includes data on leap seconds, and this library provides utilities to compute with that information as well.
* Documentation: http://howardhinnant.github.io/date/tz.html
* Video: https://www.youtube.com/watch?v=Vwd3pduVGKY
* Slides: http://schd.ws/hosted_files/cppcon2016/0f/Welcome%20To%20The%20Time%20Zone%20-%20Howard%20Hinnant%20-%20CppCon%202016.pdf
3. `"iso_week.h"` is a header-only library built on top of the `"date.h"` library which implements the ISO week date calendar.
* Documentation: http://howardhinnant.github.io/date/iso_week.html
4. `"julian.h"` is a header-only library built on top of the `"date.h"` library which implements a proleptic Julian calendar which is fully interoperable with everything above.
* Documentation: http://howardhinnant.github.io/date/julian.html
5. `"islamic.h"` is a header-only library built on top of the `"date.h"` library which implements a proleptic Islamic calendar which is fully interoperable with everything above.
* Documentation: http://howardhinnant.github.io/date/islamic.html
`"date.h"` and `"tz.h"` are now being proposed for standardization:
* Current proposal: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0355r4.html
List of projects using this library:
* www.safe.com
* www.webtoolkit.eu/wt
If you would like your project (or product) on this list, just let me know.