C Date and time utilities

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (哋它亢++20) Dynamic memory management Program utilities Coroutine support (哋它亢++20) Variadic functions is_constant_evaluated (哋它亢++20) is_within_lifetime (哋它亢++26) initializer_list (哋它亢++11) source_location (哋它亢++20) Debugging support is_debugger_present (哋它亢++26) breakpoint_if_debugging (哋它亢++26) breakpoint (哋它亢++26) Three-way comparison three_way_comparablethree_way_comparable_with (哋它亢++20)(哋它亢++20) strong_ordering (哋它亢++20) weak_ordering (哋它亢++20) partial_ordering (哋它亢++20) common_comparison_category (哋它亢++20) compare_three_way_result (哋它亢++20) compare_three_way (哋它亢++20) strong_order (哋它亢++20) weak_order (哋它亢++20) partial_order (哋它亢++20) compare_strong_order_fallback (哋它亢++20) compare_weak_order_fallback (哋它亢++20) compare_partial_order_fallback (哋它亢++20)    is_eqis_ltis_lteq (哋它亢++20)(哋它亢++20)(哋它亢++20) is_neqis_gtis_gteq (哋它亢++20)(哋它亢++20)(哋它亢++20)

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

 

Date and time utilities

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

 

C-style date and time utilities

Functions

Time manipulation

difftime

time

clock

timespec_get (哋它亢++17)

Format conversions

asctime

ctime

strftime

wcsftime

gmtime

localtime

mktime

Constants

CLOCKS_PER_SEC

Types

tm

time_t

clock_t

timespec (哋它亢++17)

 

Functions

Defined in header <ctime>
Time manipulation
difftime	computes the difference between times (function)
time	returns the current time of the system as time since epoch (function)
clock	returns raw processor clock time since the program is started (function)
timespec_get (哋它亢++17)	returns the calendar time in seconds and nanoseconds based on a given time base (function)
Format conversions
asctime	converts a std::tm object to a textual representation (function)
ctime	converts a std::time_t object to a textual representation (function)
strftime	converts a std::tm object to custom textual representation (function)
wcsftime	converts a std::tm object to custom wide string textual representation (function)
gmtime	converts time since epoch to calendar time expressed as Universal Coordinated Time (function)
localtime	converts time since epoch to calendar time expressed as local time (function)
mktime	converts calendar time to time since epoch (function)

Constants

CLOCKS_PER_SEC

number of processor clock ticks per second (macro constant)

Types

tm	calendar time type (class)
time_t	time since epoch type (typedef)
clock_t	process running time (typedef)
timespec (哋它亢++17)	time in seconds and nanoseconds (struct)