27 Time library [time]

27.6 Class template time_­point [time.point]

27.6.5 Non-member arithmetic [time.point.nonmember]

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template<class Clock, class Duration1, class Rep2, class Period2> constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>> operator+(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
1
#
Returns: CT(lhs.time_­since_­epoch() + rhs), where CT is the type of the return value.
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template<class Rep1, class Period1, class Clock, class Duration2> constexpr time_point<Clock, common_type_t<duration<Rep1, Period1>, Duration2>> operator+(const duration<Rep1, Period1>& lhs, const time_point<Clock, Duration2>& rhs);
2
#
Returns: rhs + lhs.
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template<class Clock, class Duration1, class Rep2, class Period2> constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>> operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
3
#
Returns: CT(lhs.time_­since_­epoch() - rhs), where CT is the type of the return value.
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template<class Clock, class Duration1, class Duration2> constexpr common_type_t<Duration1, Duration2> operator-(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
4
#
Returns: lhs.time_­since_­epoch() - rhs.time_­since_­epoch().