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.

A `utc_time`

representing the same point in time as `t`

.

[static] | converts `utc_time` to `sys_time` (public static member function) |

(C++20) | convert time points of one clock to another (function template) |

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