# std::chrono::utc_clock::from_sys

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< cpp‎ | chrono‎ | utc clock

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

to_sys [static] | converts `utc_time` to `sys_time` (public static member function)
clock_cast (C++20) | convert time points of one clock to another (function template)

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