template <class Duration>
static std::chrono::utc_time<std::common_type_t<Duration, std::chrono::seconds>>
    from_sys(const std::chrono::sys_time<Duration>& t);
(since C++20)

Converts a sys_time t to a utc_time u that represents the same point in time.

u.time_since_epoch() - t.time_since_epoch() is equal to the number of leap seconds that was inserted between t and 1 January 1970. If t is the exact date of a leap second insertion, that leap second is counted as inserted.

Return value

A utc_time representing the same point in time as t.

See also

converts utc_time to sys_time
(public static member function)
convert time points of one clock to another
(function template)

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