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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 offset 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 sec- ond 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 equivalent to 2018-01-01 00:00:37 TAI. tai_clock meets the Clock requirements. It does not meet the Triv- ialClock requirements unless the implementation can guarantee that now() does not throw an exception. Time point family Defined in namespace std::chrono template<class Duration> using tai_time = std::chrono::time_point<std::chrono::tai_clock, (since C++20) Duration>; using tai_seconds = tai_time<std::chrono::seconds>; (since C++20) operator<<(std::chrono::tai_time) performs stream output on a tai_time (C++20) (function template) from_stream(std::chrono::tai_time) parses a tai_time from a stream according to (C++20) the provided format (function template) std::formatter<std::chrono::tai_time> specialization of std::format- ter that formats (C++20) a tai_time according to the provided format (class template specializa- tion) 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 repre- senting negative durations time_point std::chrono::time_point<std::chrono::tai_clock> Member constants true if the time between ticks is always constant, i.e. constexpr bool is_steady calls to now() return values that increase monotonically [static] even in case of some external clock adjust- ment, 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 2022.07.31 std::chrono::tai_clock(3)
NAME | Synopsis | Member types | Member constants | Member functions
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