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std::chrono::utc_clock(3)      C++ Standard Libary     std::chrono::utc_clock(3)

NAME
     std::chrono::utc_clock - std::chrono::utc_clock

Synopsis
	Defined in header <chrono>
	class utc_clock;	    (since C++20)

	The  clock std::chrono::utc_clock is a Clock that represents Coordinated
     Universal
	Time (UTC). It measures time since 00:00:00  UTC,  Thursday,  1  January
     1970, including
	leap seconds.

	utc_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::utc_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_sys	 converts utc_time to sys_time
	[static] (public static member function)
	from_sys converts sys_time to utc_time
	[static] (public static member function)

Non-member functions
	get_leap_second_info  obtains  leap  second insertion information from a
     utc_time
	(C++20) 	     object
			     (function template)

Helper classes
	leap_second_info leap second insertion information
	(C++20) 	 (class)

Notes
	The official UTC epoch is 1 January 1972. utc_clock uses 1 January  1970
     instead to
	be consistent with std::chrono::system_clock.

http://cppreference.com 	   2024.06.10	       std::chrono::utc_clock(3)
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