std::chrono(3)             Library Functions Manual             std::chrono(3)

NAME
       std::chrono - ISO C++ 2011 namespace for date and time utilities.


SYNOPSIS
   Classes
       class duration
           chrono::duration represents a distance between two points in time
       struct duration_values
           duration_values
       class gps_clock
       class hh_mm_ss
       struct steady_clock
           Monotonic clock.
       struct system_clock
           System clock.
       class tai_clock
       class time_point
           chrono::time_point represents a point in time as measured by a
           clock
       struct treat_as_floating_point
       class tzdb_list
       class utc_clock

   Typedefs
       using days
           days
       using file_clock
       template<typename _Duration> using file_time
       using gps_seconds
       template<typename _Duration> using gps_time
       using high_resolution_clock
           Highest-resolution clock.
       using hours
           hours
       using local_days
       using local_seconds
       template<typename _Duration> using local_time
       using microseconds
           microseconds
       using milliseconds
           milliseconds
       using minutes
           minutes
       using months
           months
       using nanoseconds
           nanoseconds
       using seconds
           seconds
       using sys_days
       using sys_seconds
       template<typename _Duration> using sys_time
       using tai_seconds
       template<typename _Duration> using tai_time
       using utc_seconds
       template<typename _Duration> using utc_time
       using weeks
           weeks
       using years
           years
       using zoned_seconds

   Enumerations
       enum class choose { earliest, latest }

   Functions
       template<typename _Duration> void __throw_bad_local_time (const
           local_time< _Duration > &__tp, const local_info &__i)
       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_v< _ToDur >, time_point< _Clock, _ToDur
           > > ceil (const time_point< _Clock, _Dur > &__tp)
       template<typename _DestClock, typename _SourceClock, typename
           _Duration>
           requires __detail::__clock_convs<_DestClock, _SourceClock,
           _Duration> || __detail::__clock_convs_sys<_DestClock, _SourceClock,
           _Duration> || __detail::__clock_convs_utc<_DestClock, _SourceClock,
           _Duration> || __detail::__clock_convs_sys_utc<_DestClock,
           _SourceClock, _Duration> ||
           __detail::__clock_convs_utc_sys<_DestClock, _SourceClock,
           _Duration>auto clock_cast (const time_point< _SourceClock,
           _Duration > &__t)"
           Convert a time point to a different clock.
       const time_zone * current_zone ()
       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_v< _ToDur >, time_point< _Clock, _ToDur
           > > floor (const time_point< _Clock, _Dur > &__tp)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt, day
           &__d, basic_string< _CharT, _Traits, _Alloc > *__abbrev=nullptr,
           minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Rep, typename
           _Period, typename _Alloc = allocator<_CharT>> basic_istream<
           _CharT, _Traits > & from_stream (basic_istream< _CharT, _Traits >
           &__is, const _CharT *__fmt, duration< _Rep, _Period > &__d,
           basic_string< _CharT, _Traits, _Alloc > *__abbrev=nullptr, minutes
           *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, file_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, gps_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, local_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt, month
           &__m, basic_string< _CharT, _Traits, _Alloc > *__abbrev=nullptr,
           minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt,
           month_day &__md, basic_string< _CharT, _Traits, _Alloc >
           *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, sys_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, tai_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc = allocator<_CharT>> basic_istream< _CharT, _Traits
           > & from_stream (basic_istream< _CharT, _Traits > &__is, const
           _CharT *__fmt, utc_time< _Duration > &__tp, basic_string< _CharT,
           _Traits, _Alloc > *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt,
           weekday &__wd, basic_string< _CharT, _Traits, _Alloc >
           *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt, year
           &__y, basic_string< _CharT, _Traits, _Alloc > *__abbrev=nullptr,
           minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt,
           year_month &__ym, basic_string< _CharT, _Traits, _Alloc >
           *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _CharT, typename _Traits, typename _Alloc =
           allocator<_CharT>> basic_istream< _CharT, _Traits > & from_stream
           (basic_istream< _CharT, _Traits > &__is, const _CharT *__fmt,
           year_month_day &__ymd, basic_string< _CharT, _Traits, _Alloc >
           *__abbrev=nullptr, minutes *__offset=nullptr)
       template<typename _Duration> leap_second_info get_leap_second_info
           (const utc_time< _Duration > &__ut)
       const tzdb & get_tzdb ()
       tzdb_list & get_tzdb_list ()
       constexpr bool is_am (const hours &__h) noexcept
       constexpr bool is_pm (const hours &__h) noexcept
       template<typename _Duration> __detail::__local_time_fmt< _Duration >
           local_time_format (local_time< _Duration > __time, const string
           *__abbrev=nullptr, const seconds *__offset_sec=nullptr)
       const time_zone * locate_zone (string_view __tz_name)
       constexpr hours make12 (const hours &__h) noexcept
       constexpr hours make24 (const hours &__h, bool __is_pm) noexcept
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const day &__d)
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const file_time< _Duration > &__t)
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const gps_time< _Duration > &__t)
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const hh_mm_ss< _Duration > &__hms)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const local_info &__li)
           Writes a local_info object to an ostream in an unspecified format.
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const local_time< _Duration > &__lt)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const month &__m)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const month_day &__md)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const month_day_last &__mdl)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const month_weekday &__mwd)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const month_weekday_last &__mwdl)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const sys_days &__dp)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const sys_info &__i)
           Writes a sys_info object to an ostream in an unspecified format.
       template<typename _CharT, typename _Traits, typename _Duration>
           requires (!treat_as_floating_point_v<typename _Duration::rep>) &&
           ratio_less_v<typename _Duration::period,
           days::period>basic_ostream< _CharT, _Traits > & operator<<
           (basic_ostream< _CharT, _Traits > &__os, const sys_time< _Duration
           > &__tp)"
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const tai_time< _Duration > &__t)
       template<typename _CharT, typename _Traits, typename _Duration>
           basic_ostream< _CharT, _Traits > & operator<< (basic_ostream<
           _CharT, _Traits > &__os, const utc_time< _Duration > &__t)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const weekday &__wd)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const weekday_indexed &__wdi)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const weekday_last &__wdl)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year &__y)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year_month &__ym)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year_month_day &__ymd)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year_month_day_last &__ymdl)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year_month_weekday &__ymwd)
       template<typename _CharT, typename _Traits> basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const year_month_weekday_last &__ymwdl)
       template<typename _CharT, typename _Traits, typename _Duration,
           typename _TimeZonePtr> basic_ostream< _CharT, _Traits > &
           operator<< (basic_ostream< _CharT, _Traits > &__os, const
           zoned_time< _Duration, _TimeZonePtr > &__t)
       template<typename _CharT, typename _Traits, typename _Rep, typename
           _Period> basic_ostream< _CharT, _Traits > & operator<<
           (std::basic_ostream< _CharT, _Traits > &__os, const duration< _Rep,
           _Period > &__d)
       template<typename _Dur1, typename _TZPtr1, typename _Dur2, typename
           _TZPtr2> bool operator== (const zoned_time< _Dur1, _TZPtr1 > &__x,
           const zoned_time< _Dur2, _TZPtr2 > &__y)
       template<typename _CharT, __detail::__parsable< _CharT > _Parsable>
           auto parse (const _CharT *__fmt, _Parsable &__tp)
       template<typename _CharT, typename _Traits, typename _Alloc, typename
           _StrT = basic_string<_CharT, _Traits, _Alloc>,
           __detail::__parsable< _CharT, _Traits, _StrT > _Parsable> auto
           parse (const _CharT *__fmt, _Parsable &__tp, basic_string< _CharT,
           _Traits, _Alloc > &__abbrev)
       template<typename _CharT, typename _Traits, typename _Alloc, typename
           _StrT = basic_string<_CharT, _Traits, _Alloc>,
           __detail::__parsable< _CharT, _Traits, _StrT, minutes > _Parsable>
           auto parse (const _CharT *__fmt, _Parsable &__tp, basic_string<
           _CharT, _Traits, _Alloc > &__abbrev, minutes &__offset)
       template<typename _CharT, typename _Traits = char_traits<_CharT>,
           typename _StrT = basic_string<_CharT, _Traits>,
           __detail::__parsable< _CharT, _Traits, _StrT, minutes > _Parsable>
           auto parse (const _CharT *__fmt, _Parsable &__tp, minutes
           &__offset)
       template<typename _CharT, typename _Traits, typename _Alloc,
           __detail::__parsable< _CharT, _Traits > _Parsable> auto parse
           (const basic_string< _CharT, _Traits, _Alloc > &__fmt, _Parsable
           &__tp)
       template<typename _CharT, typename _Traits, typename _Alloc, typename
           _StrT = basic_string<_CharT, _Traits, _Alloc>,
           __detail::__parsable< _CharT, _Traits, _StrT > _Parsable> auto
           parse (const basic_string< _CharT, _Traits, _Alloc > &__fmt,
           _Parsable &__tp, basic_string< _CharT, _Traits, _Alloc > &__abbrev)
       template<typename _CharT, typename _Traits, typename _Alloc, typename
           _StrT = basic_string<_CharT, _Traits, _Alloc>,
           __detail::__parsable< _CharT, _Traits, _StrT, minutes > _Parsable>
           auto parse (const basic_string< _CharT, _Traits, _Alloc > &__fmt,
           _Parsable &__tp, basic_string< _CharT, _Traits, _Alloc > &__abbrev,
           minutes &__offset)
       template<typename _CharT, typename _Traits, typename _Alloc, typename
           _StrT = basic_string<_CharT, _Traits>, __detail::__parsable<
           _CharT, _Traits, _StrT, minutes > _Parsable> auto parse (const
           basic_string< _CharT, _Traits, _Alloc > &__fmt, _Parsable &__tp,
           minutes &__offset)
       const tzdb & reload_tzdb ()
       string remote_version ()
       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< __is_duration_v< _ToDur >
           &&!treat_as_floating_point_v< typename _ToDur::rep >, 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)
       zoned_time () -> zoned_time< seconds >
       template<typename _TimeZonePtrOrName> zoned_time (_TimeZonePtrOrName
           &&) -> zoned_time< seconds, __time_zone_representation<
           _TimeZonePtrOrName > >
       template<typename _TimeZonePtrOrName, typename _Duration> zoned_time
           (_TimeZonePtrOrName &&, local_time< _Duration >,
           choose=choose::earliest) -> zoned_time< common_type_t< _Duration,
           seconds >, __time_zone_representation< _TimeZonePtrOrName > >
       template<typename _TimeZonePtrOrName, typename _Duration> zoned_time
           (_TimeZonePtrOrName &&, sys_time< _Duration >) -> zoned_time<
           common_type_t< _Duration, seconds >, __time_zone_representation<
           _TimeZonePtrOrName > >
       template<typename _Duration, typename _TimeZonePtrOrName, typename
           _TimeZonePtr2> zoned_time (_TimeZonePtrOrName &&, zoned_time<
           _Duration, _TimeZonePtr2 >, choose=choose::earliest) -> zoned_time<
           common_type_t< _Duration, seconds >, __time_zone_representation<
           _TimeZonePtrOrName > >
       template<typename _Duration> zoned_time (sys_time< _Duration >) ->
           zoned_time< common_type_t< _Duration, seconds > >


           template<typename _Clock, typename _Dur1,
               three_way_comparable_with< _Dur1 > _Dur2> constexpr auto
               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
       template<typename _Tp, typename _Clock> constexpr bool
           __is_time_point_for_v
       template<typename _Clock, typename _Duration> constexpr bool
           __is_time_point_for_v< time_point< _Clock, _Duration >, _Clock >
       constexpr month April
       constexpr month August
       constexpr month December
       constexpr month February
       constexpr weekday Friday
       template<typename _Tp, typename = void> constexpr bool is_clock_v
       template<typename _Tp> constexpr bool is_clock_v< _Tp, void_t< typename
           _Tp::rep, typename _Tp::period, typename _Tp::duration, typename
           _Tp::time_point::duration, decltype(_Tp::is_steady),
           decltype(_Tp::now())> >
       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
       template<> constexpr bool treat_as_floating_point_v< double >
       template<> constexpr bool treat_as_floating_point_v< float >
       template<> constexpr bool treat_as_floating_point_v< int >
       template<> constexpr bool treat_as_floating_point_v< long >
       template<> constexpr bool treat_as_floating_point_v< long double >
       template<> constexpr bool treat_as_floating_point_v< long long >
       constexpr weekday Tuesday
       constexpr weekday Wednesday
       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)
           The difference between two durations.
       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)
           The sum of two durations.
       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 _Period, typename _Rep2> constexpr
           duration< __common_rep_t< _Rep1, _Rep2 >, _Period > operator*
           (const duration< _Rep1, _Period > &__d, const _Rep2 &__s)
       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>
           requires three_way_comparable<common_type_t<_Rep1, _Rep2>>constexpr
           auto 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)
           Adjust a time point forwards by the given duration.
       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)
           Adjust a time point backwards by the given duration.
       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)
           The difference between two time points (as a duration).
       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)
           Adjust a time point forwards by the given duration.

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

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

                                   libstdc++                    std::chrono(3)