std::chrono::utc_clock

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C-style date and time
 
std::chrono::utc_clock
 
Defined in header <chrono>
class utc_clock;
 (since 哋它亢++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 TrivialClock 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 utc_time = std::chrono::time_point<std::chrono::utc_clock, Duration>;
 (since 哋它亢++20)
using utc_seconds = utc_time<std::chrono::seconds>;
 (since 哋它亢++20)
(哋它亢++20)
 performs stream output on a utc_time
(function template)
(哋它亢++20)
 parses a utc_time from a stream according to the provided format
(function template)
(哋它亢++20)
 formatting support for utc_time
(class template specialization)

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

constexpr bool is_steady
[static]
 true if the time between ticks is always constant, i.e. calls to now() return values that increase monotonically even in case of some external clock adjustment, otherwise false
(public static member constant)

Member functions

[static]
 returns a std::chrono::time_point representing the current point in time
(public static member function)
[static]
 converts utc_time to sys_time
(public static member function)
[static]
 converts sys_time to utc_time
(public static member function)

Non-member functions

(哋它亢++20)
 obtains leap second insertion information from a utc_time object
(function template)

Helper classes

(哋它亢++20)
 leap second insertion information
(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.

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