This is actually several separate C++11/C++14 libraries:
- 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.
- 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.
- chrono_io.h is a header-only library for streaming out chrono
durations.
- iso_week.h is a header-only library built on top of the
date.h library which implements the ISO week date calendar.
- 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.
- 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.
date.h and tz.h are now being proposed for standardization:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0355r1.html
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