std::chrono Namespace Reference
Utilities » Time

## Classes

class | duration
struct | duration_values
struct | steady_clock
struct | system_clock
class | time_point
struct | treat_as_floating_point

## Typedefs

using | days = duration< int64_t, ratio< 86400 > >
using | file_clock = ::std::filesystem::__file_clock
template<typename _Duration >
using | file_time = time_point< file_clock, _Duration >
using | gps_seconds = gps_time< seconds >
template<typename _Duration >
using | gps_time = time_point< gps_clock, _Duration >
using | high_resolution_clock = system_clock
using | hours = duration< int64_t, ratio< 3600 > >
using | local_days = local_time< days >
using | local_seconds = local_time< seconds >
template<typename _Duration >
using | local_time = time_point< local_t, _Duration >
using | microseconds = duration< int64_t, micro >
using | milliseconds = duration< int64_t, milli >
using | minutes = duration< int64_t, ratio< 60 > >
using | months = duration< int64_t, ratio< 2629746 > >
using | nanoseconds = duration< int64_t, nano >
using | seconds = duration< int64_t >
using | sys_days = sys_time< days >
using | sys_seconds = sys_time< seconds >
template<typename _Duration >
using | sys_time = time_point< system_clock, _Duration >
using | tai_seconds = tai_time< seconds >
template<typename _Duration >
using | tai_time = time_point< tai_clock, _Duration >
using | utc_seconds = utc_time< seconds >
template<typename _Duration >
using | utc_time = time_point< utc_clock, _Duration >
using | weeks = duration< int64_t, ratio< 604800 > >
using | years = duration< int64_t, ratio< 31556952 > >

## Functions

template<typename _Rep , typename _Period >
constexpr enable_if_t< numeric_limits< _Rep >::is_signed, duration< _Rep, _Period > > | abs (duration< _Rep, _Period > __d)
template<typename _ToDur , typename _Rep , typename _Period >
constexpr __enable_if_is_duration< _ToDur > | ceil (const duration< _Rep, _Period > &__d)
template<typename _ToDur , typename _Clock , typename _Dur >
constexpr enable_if_t< __is_duration< _ToDur >::value, time_point< _Clock, _ToDur > > | ceil (const time_point< _Clock, _Dur > &__tp)
template<typename _ToDur , typename _Rep , typename _Period >
constexpr __enable_if_is_duration< _ToDur > | duration_cast (const duration< _Rep, _Period > &__d)
template<typename _ToDur , typename _Rep , typename _Period >
constexpr __enable_if_is_duration< _ToDur > | floor (const duration< _Rep, _Period > &__d)
template<typename _ToDur , typename _Clock , typename _Dur >
constexpr enable_if_t< __is_duration< _ToDur >::value, time_point< _Clock, _ToDur > > | floor (const time_point< _Clock, _Dur > &__tp)
constexpr bool | is_am (const hours &__h) noexcept
constexpr bool | is_pm (const hours &__h) noexcept
constexpr hours | make12 (const hours &__h) noexcept
constexpr hours | make24 (const hours &__h, bool __is_pm) noexcept
template<typename _ToDur , typename _Rep , typename _Period >
constexpr enable_if_t< __and_< __is_duration< _ToDur >, __not_< treat_as_floating_point< typename _ToDur::rep > > >::value, _ToDur > | round (const duration< _Rep, _Period > &__d)
template<typename _ToDur , typename _Clock , typename _Dur >
constexpr enable_if_t< __and_< __is_duration< _ToDur >, __not_< treat_as_floating_point< typename _ToDur::rep > > >::value, time_point< _Clock, _ToDur > > | round (const time_point< _Clock, _Dur > &__tp)
template<typename _ToDur , typename _Clock , typename _Dur >
constexpr __enable_if_t< __is_duration< _ToDur >::value, time_point< _Clock, _ToDur > > | time_point_cast (const time_point< _Clock, _Dur > &__t)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr common_type< duration< _Rep1, _Period1 >, duration< _Rep2, _Period2 > >::type | operator- (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Rep2 , typename _Period >
constexpr duration< __common_rep_t< _Rep2, _Rep1 >, _Period > | operator* (const _Rep1 &__s, const duration< _Rep2, _Period > &__d)
template<typename _Rep1 , typename _Period , typename _Rep2 >
constexpr duration< __common_rep_t< _Rep1, __disable_if_is_duration< _Rep2 > >, _Period > | operator/ (const duration< _Rep1, _Period > &__d, const _Rep2 &__s)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr common_type< _Rep1, _Rep2 >::type | operator/ (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period , typename _Rep2 >
constexpr duration< __common_rep_t< _Rep1, __disable_if_is_duration< _Rep2 > >, _Period > | operator% (const duration< _Rep1, _Period > &__d, const _Rep2 &__s)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr common_type< duration< _Rep1, _Period1 >, duration< _Rep2, _Period2 > >::type | operator% (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr bool | operator< (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr bool | operator!= (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr bool | operator<= (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr bool | operator> (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Rep2 , typename _Period2 >
constexpr bool | operator>= (const duration< _Rep1, _Period1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Rep1 , typename _Period1 , typename _Clock , typename _Dur2 >
constexpr time_point< _Clock, typename common_type< duration< _Rep1, _Period1 >, _Dur2 >::type > | operator+ (const duration< _Rep1, _Period1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Rep2 , typename _Period2 >
constexpr time_point< _Clock, typename common_type< _Dur1, duration< _Rep2, _Period2 > >::type > | operator- (const time_point< _Clock, _Dur1 > &__lhs, const duration< _Rep2, _Period2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr common_type< _Dur1, _Dur2 >::type | operator- (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr bool | operator!= (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr bool | operator< (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr bool | operator<= (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr bool | operator> (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)
template<typename _Clock , typename _Dur1 , typename _Dur2 >
constexpr bool | operator>= (const time_point< _Clock, _Dur1 > &__lhs, const time_point< _Clock, _Dur2 > &__rhs)

## Variables

constexpr month | April
constexpr month | August
constexpr month | December
constexpr month | February
constexpr weekday | Friday
template<typename _Tp >
constexpr bool | is_clock_v
template<>
constexpr bool | is_clock_v< file_clock >
template<>
constexpr bool | is_clock_v< gps_clock >
template<>
constexpr bool | is_clock_v< steady_clock >
template<>
constexpr bool | is_clock_v< system_clock >
template<>
constexpr bool | is_clock_v< tai_clock >
template<>
constexpr bool | is_clock_v< utc_clock >
constexpr month | January
constexpr month | July
constexpr month | June
constexpr last_spec | last
constexpr month | March
constexpr month | May
constexpr weekday | Monday
constexpr month | November
constexpr month | October
constexpr weekday | Saturday
constexpr month | September
constexpr weekday | Sunday
constexpr weekday | Thursday
template<typename _Rep >
constexpr bool | treat_as_floating_point_v
constexpr weekday | Tuesday
constexpr weekday | Wednesday

## Detailed Description

ISO C++ 2011 namespace for date and time utilities.