std::chrono::utc_clock::from_sys
Min standard notice:
Converts a sys_time t to a utc_time u that represents the same point in time.
# Declarations
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)
# Return value
A utc_time representing the same point in time as t.