# std::chrono::tai_clock::from_utc

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< cpp‎ | chrono‎ | tai clock

template <class Duration> static std::chrono::tai_time<std::common_type_t<Duration, std::chrono::seconds>> from_utc(const std::chrono::utc_time<Duration>&) noexcept; |  | (since C++20)

Converts the `utc_time` `t` to a `tai_time` representing the same point in time.

### Return value

A std::chrono::tai_time representing the same point in time as `t`, computed as if by constructing a value of the return type from t.time_since_epoch() and adding 378691210s. (378691210 is the number of seconds between the epochs of the two clocks: 1958-01-01 00:00:00 TAI and 1970-01-01 00:00:00 UTC.)

### See also

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

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