[time.clock.cast.fn]

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template<class DestClock, class SourceClock, class Duration>
  auto clock_cast(const time_point<SourceClock, Duration>& t);

Constraints: At least one of the following clock time conversion expressions is well-formed:

(1.1)
clock_time_conversion<DestClock, SourceClock>{}(t)
(1.2)
clock_time_conversion<DestClock, system_clock>{}( clock_time_conversion<system_clock, SourceClock>{}(t))
(1.3)
clock_time_conversion<DestClock, utc_clock>{}( clock_time_conversion<utc_clock, SourceClock>{}(t))
(1.4)
clock_time_conversion<DestClock, utc_clock>{}( clock_time_conversion<utc_clock, system_clock>{}( clock_time_conversion<system_clock, SourceClock>{}(t))
(1.5)
clock_time_conversion<DestClock, system_clock>{}( clock_time_conversion<system_clock, utc_clock>{}( clock_time_conversion<utc_clock, SourceClock>{}(t))

A clock time conversion expression is considered better than another clock time conversion expression if it involves fewer operator() calls on clock_time_conversion specializations.

Mandates: Among the well-formed clock time conversion expressions from the above list, there is a unique best expression.

Returns: The best well-formed clock time conversion expression in the above list.

30 Time library [time]

30.7 Clocks [time.clock]

30.7.10 time_point conversions [time.clock.cast]

30.7.10.6 Function template clock_cast [time.clock.cast.fn]