C Date and time utilities

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Date and time library

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) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) 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)

Calendar 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) chrono I/O parse (C++20)

Time zone 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) C-style date and time

 

C-style date and time utilities

Functions

Time manipulation

difftime

time

clock

timespec_get (C++17)

timespec_getres (C++26)

Format conversions

asctime (deprecated in C++26)

ctime (deprecated in C++26)

strftime

wcsftime

gmtimegmtime_r (C++26)

localtimelocaltime_r (C++26)

mktime

timegm (C++26)

Constants

CLOCKS_PER_SEC

Types

tm

time_t

clock_t

timespec (C++17)

 

Functions

Time manipulation
Defined in header <ctime>
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 (C++17)	returns the calendar time in seconds and nanoseconds based on a given time base (function)
timespec_getres (C++26)	returns the resolution of calendar time based on a given time base (function)
Format conversions
Defined in header <ctime>
asctime (deprecated in C++26)	converts a std::tm object to a textual representation (function)
ctime (deprecated in C++26)	converts a std::time_t object to a textual representation (function)
strftime	converts a std::tm object to custom textual representation (function)
Defined in header <cwchar>
wcsftime	converts a std::tm object to custom wide string textual representation (function)
Defined in header <ctime>
gmtimegmtime_r (C++26)	converts time since epoch to calendar time expressed as Universal Coordinated Time (function)
localtimelocaltime_r (C++26)	converts time since epoch to calendar time expressed as local time (function)
mktime	converts calendar time to time since epoch (function)
timegm (C++26)	converts calendar time to time since epoch, ignoring the Daylight Saving Time flag (function)

Constants

Defined in header <ctime>
CLOCKS_PER_SEC	number of processor clock ticks per second (macro constant)

Types

Defined in header <ctime>
tm	calendar time type (class)
time_t	time since epoch type (typedef)
clock_t	process running time (typedef)
timespec (C++17)	time in seconds and nanoseconds (struct)

See also

C documentation for Date and time utilities