＜chrono＞ Then and Now
summary
Chronology support in C++ moves from algebraic durations and time_points to concrete calendar and zone features: C++20 adds durations for days weeks months years, a high‑precision sys_days alias, and a civil calendar for interoperable calendars. Full time zone conversion appears with a zone_time type and clocks like utc_clock tai_clock gps_clock and file_clock to model leap seconds and multiple time systems. The library is proposed and lands in the working draft with parsing and formatting baked in.
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chapters (8)
- 0:00Intro
- 0:15timepoints
- 0:37clocks
- 0:57new durations
- 1:36calendar
- 2:13time zones
- 2:38more clocks
- 3:00parsing formatting
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