chrono

C++ <chrono> library.

A duration is a duration of time represented by an arithmetic type and a compile-time fraction indicating the number of seconds between each integral value in the representation.

A time point is a clock and a duration measuring time since the clock epoch.

A date is a time point with precision of 1 day.

The class year_month_day does year and month calculations. The class sys_days is a time_point<system_clock, day> for day oriented calculations. Conversion between them is implicit with no loss of information.

The class year_month_last is last day of year and month.

The class year_month_weekday is n-th weekday of year and month. Note 0-th weekday is last weekday of previous month. Same as weekday[last] of previous month.

The class system_clock is Unix time – time in seconds since 1970/January/1 00:00:00 UTC excluding leap seconds. The class sys_days is system_clock<days>.

Use zoned_time(const time_zone*, sys_time<Duration>) to convert timepoint to time zone. Duration must be at least seconds precision.