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59 lines
2.9 KiB
Markdown
59 lines
2.9 KiB
Markdown
# Date
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[](https://gitter.im/HowardHinnant/date?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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---
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**[Try it out on wandbox!](https://wandbox.org/permlink/L8MwjzSSC3fXXrMd)**
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## Summary
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This is actually several separate C++11/C++14/C++17 libraries:
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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.
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* Documentation: http://howardhinnant.github.io/date/date.html
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* Video: https://www.youtube.com/watch?v=tzyGjOm8AKo
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* Slides: http://schd.ws/hosted_files/cppcon2015/43/hinnant_dates.pdf
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1. `"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.
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* Documentation: http://howardhinnant.github.io/date/tz.html
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* Video: https://www.youtube.com/watch?v=Vwd3pduVGKY
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* Slides: http://schd.ws/hosted_files/cppcon2016/0f/Welcome%20To%20The%20Time%20Zone%20-%20Howard%20Hinnant%20-%20CppCon%202016.pdf
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1. `"iso_week.h"` is a header-only library built on top of the `"date.h"` library which implements the ISO week date calendar.
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* Documentation: http://howardhinnant.github.io/date/iso_week.html
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1. `"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.
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* Documentation: http://howardhinnant.github.io/date/julian.html
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1. `"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.
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* Documentation: http://howardhinnant.github.io/date/islamic.html
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## Standardization
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Slightly modified versions of `"date.h"` and `"tz.h"` were voted into the C++20 working draft at the Jacksonville FL meeting on 2018-03-17:
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* http://howardhinnant.github.io/date/d0355r7.html
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## Build & Test
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You will need [CMake](https://cmake.org/) and a recent C++ compiler. Here follows a guide of how to build and test using the CMake Makefile generator.
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```bash
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mkdir build
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cd build
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cmake ../
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cmake --build . --target testit # Consider '-- -j4' for multithreading
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```
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## Projects using this library
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* www.safe.com
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* www.webtoolkit.eu/wt
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If you would like your project (or product) on this list, just let me know.
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