std::chrono::utc_clock::from_sys(3)

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

Synopsis
   template< class Duration >
   static std::chrono::utc_time<std::common_type_t<Duration, (since C++20)
   std::chrono::seconds>>
       from_sys( const std::chrono::sys_time<Duration>& t );
   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
   to_sys converts utc_time to sys_time
   [static] (public static member function)
   clock_cast convert time points of one clock to another
   (C++20) (function template)