std::chrono::tai_clock(3) C++ Standard Libary std::chrono::tai_clock(3) NAME std::chrono::tai_clock - std::chrono::tai_clock Synopsis Defined in header <chrono> class tai_clock; (since C++20) The clock std::chrono::tai_clock is a Clock that represents Interna- tional Atomic Time (TAI). It measures time since 00:00:00, 1 January 1958, and is off- set 10 seconds ahead of UTC at that date (i.e., its epoch, 1958-01-01 00:00:00 TAI, is 1957-12-31 23:59:50 UTC). Leap seconds are not inserted into TAI. Thus, every time a leap second is inserted into UTC, UTC falls another second behind TAI. As of December 2017, UTC is 37 seconds behind TAI, reflecting the 10-second initial offset and the 27 leap seconds inserted between 1958 and 2017. Thus, 2018-01-01 00:00:00 UTC is equiva- lent to 2018-01-01 00:00:37 TAI. tai_clock meets the Clock requirements. It does not meet the Trivial- Clock requirements unless the implementation can guarantee that now() does not throw an exception. Member types Member type Definition rep signed arithmetic type representing the number of ticks in the clock's duration period a std::ratio type representing the tick period of the clock, in seconds duration std::chrono::duration<rep, period>, capable of representing negative durations time_point std::chrono::time_point<std::chrono::tai_clock> Member constants true if the time between ticks is always con- stant, i.e. constexpr bool is_steady calls to now() return values that increase mo- notonically [static] even in case of some external clock adjustment, otherwise false (public static member constant) Member functions now returns a std::chrono::time_point representing the current point in time [static] (public static member function) to_utc converts tai_time to utc_time [static] (public static member function) from_utc converts utc_time to tai_time [static] (public static member function) http://cppreference.com 2024.06.10 std::chrono::tai_clock(3)
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