tmp/tmpt4zn58zl/{from.md → to.md}
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#### Conversions between `system_clock` and other clocks <a id="time.clock.cast.sys">[[time.clock.cast.sys]]</a>
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``` cpp
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template<class SourceClock>
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struct clock_time_conversion<system_clock, SourceClock> {
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template<class Duration>
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auto operator()(const time_point<SourceClock, Duration>& t) const
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-> decltype(SourceClock::to_sys(t));
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};
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```
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``` cpp
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template<class Duration>
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auto operator()(const time_point<SourceClock, Duration>& t) const
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-> decltype(SourceClock::to_sys(t));
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```
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*Constraints:* `SourceClock::to_sys(t)` is well-formed.
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*Mandates:* `SourceClock::to_sys(t)` returns a `sys_time<Duration>`,
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where `Duration` is a valid `chrono::duration` specialization.
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*Returns:* `SourceClock::to_sys(t)`.
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``` cpp
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template<class DestClock>
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struct clock_time_conversion<DestClock, system_clock> {
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template<class Duration>
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auto operator()(const sys_time<Duration>& t) const
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-> decltype(DestClock::from_sys(t));
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};
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```
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``` cpp
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template<class Duration>
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auto operator()(const sys_time<Duration>& t) const
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-> decltype(DestClock::from_sys(t));
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```
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*Constraints:* `DestClock::from_sys(t)` is well-formed.
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*Mandates:* `DestClock::from_sys(t)` returns a
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`time_point<DestClock, Duration>`, where `Duration` is a valid
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`chrono::duration` specialization.
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*Returns:* `DestClock::from_sys(t)`.
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