23 General utilities library [utilities]

23.17 Time utilities [time]

23.17.6 Class template time_­point [time.point]

23.17.6.7 time_­point_­cast [time.point.cast]

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> time_point_cast(const time_point<Clock, Duration>& t);

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Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

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Returns: 

time_point<Clock, ToDuration>(duration_cast<ToDuration>(t.time_since_epoch()))

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> floor(const time_point<Clock, Duration>& tp);

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Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

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Returns: time_­point<Clock, ToDuration>(floor<ToDuration>(tp.time_­since_­epoch())).

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> ceil(const time_point<Clock, Duration>& tp);

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Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration.

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Returns: time_­point<Clock, ToDuration>(ceil<ToDuration>(tp.time_­since_­epoch())).

template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> round(const time_point<Clock, Duration>& tp);

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Remarks: This function shall not participate in overload resolution unless ToDuration is a specialization of duration, and treat_­as_­floating_­point_­v<typename ToDuration​::​rep> is false.

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Returns: time_­point<Clock, ToDuration>(round<ToDuration>(tp.time_­since_­epoch())).