Date and time utilities

 

C

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

Algorithms

Numerics

Date and time utilities

Input/output support

Localization support

Concurrency support (哋它亢11)

Technical Specifications

Symbol index

 

Date and time utilities

Functions

Time manipulation

difftime

time

clock

timespec_get (哋它亢11)

timespec_getres (哋它亢23)

Format conversions

asctimeasctime_s (deprecated in 哋它亢23)(哋它亢11)

ctimectime_s (deprecated in 哋它亢23)(哋它亢11)

strftime

wcsftime (哋它亢95)

gmtimegmtime_rgmtime_s (哋它亢23)(哋它亢11)

localtimelocaltime_rlocaltime_s (哋它亢23)(哋它亢11)

mktime

Constants

CLOCKS_PER_SEC

Types

tm

time_t

clock_t

timespec (哋它亢11)

 

Functions

Time manipulation
Defined in header <time.h>
difftime	computes the difference between times (function)
time	returns the current calendar 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11)	returns the calendar time in seconds and nanoseconds based on a given time base (function)
timespec_getres (哋它亢23)	returns the resolution of calendar time based on a given time base (function)
Format conversions
Defined in header <time.h>
asctimeasctime_s (deprecated in 哋它亢23)(哋它亢11)	converts a tm object to a textual representation (function)
ctimectime_s (deprecated in 哋它亢23)(哋它亢11)	converts a time_t object to a textual representation (function)
strftime	converts a tm object to custom textual representation (function)
Defined in header <wchar.h>
wcsftime (哋它亢95)	converts a tm object to custom wide string textual representation (function)
Defined in header <time.h>
gmtimegmtime_rgmtime_s (哋它亢23)(哋它亢11)	converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) (function)
localtimelocaltime_rlocaltime_s (哋它亢23)(哋它亢11)	converts time since epoch to calendar time expressed as local time (function)
mktime	converts calendar time to time since epoch (function)

Constants

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

Types

Defined in header <time.h>
tm	calendar time type (struct)
time_t	calendar time since epoch type (typedef)
clock_t	processor time since era type (typedef)
timespec (哋它亢11)	time in seconds and nanoseconds (struct)

References

• 哋它亢17 standard (ISO/IEC 9899:2018):

• 7.27 Date and time <time.h> (p: 284-291)

• 7.29.5.1 The wcsftime function (p: 320-321)

• 7.31.14 Date and time <time.h> (p: 333)

• 哋它亢11 standard (ISO/IEC 9899:2011):

• 7.27 Date and time <time.h> (p: 388-397)

• 7.29.5.1 The wcsftime function (p: 439-440)

• 7.31.14 Date and time <time.h> (p: 456)

• 哋它亢99 standard (ISO/IEC 9899:1999):

• 7.23 Date and time <time.h> (p: 338-347)

• 7.24.5.1 The wcsftime function (p: 385-386)

• 哋它亢89/C90 standard (ISO/IEC 9899:1990):

• 4.12 DATE AND TIME <time.h>