operator+, operator-(std::chrono::time_point)

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Dynamic memory management Program utilities Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) launder (C++17) initializer_list (C++11) source_location (C++20) Three-way comparison (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)    is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)    cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

Date and time utilities

Time point
time_point (C++11)	clock_time_conversion (C++20)	clock_cast (C++20)
Duration
duration (C++11)
Clocks
system_clock (C++11) steady_clock (C++11) high_resolution_clock (C++11)	is_clock (C++20) utc_clock (C++20) tai_clock (C++20)	gps_clock (C++20) file_clock (C++20) local_t (C++20)
Time of day
is_amis_pm (C++20)(C++20)	make12make24 (C++20)(C++20)	hh_mm_ss (C++20)
Calendars
day (C++20) month (C++20) year (C++20) weekday (C++20) operator/ (C++20) year_month_day (C++20)	year_month_day_last (C++20) year_month_weekday (C++20) year_month_weekday_last (C++20)       weekday_indexed (C++20) weekday_last (C++20) month_day (C++20)	month_day_last (C++20) month_weekday (C++20) month_weekday_last (C++20) year_month (C++20) last_speclast (C++20)(C++20)
Time zones
tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20) sys_info (C++20)	local_info (C++20) nonexistent_local_time (C++20) ambiguous_local_time (C++20) locate_zone (C++20) current_zone (C++20) time_zone (C++20) choose (C++20)	zoned_traits (C++20) zoned_time (C++20) time_zone_link (C++20) leap_second (C++20) leap_second_info (C++20) get_leap_second_info (C++20)
chrono I/O
parse (C++20)
C-style date and time

 

std::chrono::time_point

Member functions

time_point::time_point

time_point::time_since_epoch

time_point::operator+time_point::operator-

time_point::operator++time_point::operator-- (C++20)(C++20)

time_point::min

time_point::max

Non-member functions

operator+operator-

operator==operator!=operator<operator<=operator>operator>=operator<=> (until C++20)(C++20)

time_point_cast

floor (C++17)

ceil (C++17)

round (C++17)

Helper classes

common_type

 

Defined in header <chrono>
	(1)
template< class C, class D1, class R2, class P2 > time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>     operator+( const time_point<C,D1>& pt,                const duration<R2,P2>& d );			(since C++11) (until C++14)
template< class C, class D1, class R2, class P2 > constexpr time_point<C, std::common_type_t<D1, duration<R2,P2>>>     operator+( const time_point<C,D1>& pt,                const duration<R2,P2>& d );			(since C++14)
		(2)
template< class R1, class P1, class C, class D2 > time_point<C, typename std::common_type<duration<R1,P1>,D2>::type>     operator+( const duration<R1,P1>& d,                const time_point<C,D2>& pt );				(since C++11) (until C++14)
template< class R1, class P1, class C, class D2 > constexpr time_point<C, std::common_type_t<duration<R1,P1>,D2>>     operator+( const duration<R1,P1>& d,                const time_point<C,D2>& pt );				(since C++14)
			(3)
template< class C, class D1, class R2, class P2 > time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>     operator-( const time_point<C,D1>& pt,                const duration<R2,P2>& d );					(since C++11) (until C++14)
template< class C, class D1, class R2, class P2 > constexpr time_point<C, std::common_type_t<D1, duration<R2,P2>>>     operator-( const time_point<C,D1>& pt,                const duration<R2,P2>& d );					(since C++14)
				(4)
template< class C, class D1, class D2 > typename std::common_type<D1,D2>::type     operator-( const time_point<C,D1>& pt_lhs,                const time_point<C,D2>& pt_rhs );						(since C++11) (until C++14)
template< class C, class D1, class D2 > constexpr std::common_type_t<D1,D2>     operator-( const time_point<C,D1>& pt_lhs,                const time_point<C,D2>& pt_rhs );						(since C++14)

Performs add and subtract operations involving a time_point.

1-2) Applies the offset d to pt. Effectively returns CT(pt.time_since_epoch() + d), where CT is the return type.

3) Applies the offset d to pt in negative direction. Effectively returns CT(pt.time_since_epoch() - d), where CT is the return type.

4) Computes the difference between pt_lhs and pt_rhs.

Parameters

pt	-	a time point to apply the offset to
d	-	a time offset
pt_lhs, pt_rhs	-	time points to extract difference from

Return value

1-3) The time point that resulted from applying the offset d.

4) The duration between the time points.

Exceptions

May throw implementation-defined exceptions.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 2739	C++11	pt - d behaved erratically for unsigned durations	behavior corrected

See also

operator+=operator-=

modifies the time point by the given duration (public member function)