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Try it out on wandbox!

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/p0355r3.html

* Revision 4 draft:  http://howardhinnant.github.io/date/d0355r4.html