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Standard library header <time.h>

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This header is part of date and time utilities library.

[edit] Functions

Time manipulation
computes the difference between times
(function) [edit]
returns the current calendar time of the system as time since epoch
(function) [edit]
returns raw processor clock time since the program is started
(function) [edit]
returns the calendar time in seconds and nanoseconds based on a given time base
(function) [edit]
returns the resolution of calendar time based on a given time base
(function) [edit]
Format conversions
(deprecated in C23)(C11)
converts a tm object to a textual representation
(function) [edit]
(deprecated in C23)(C11)
converts a time_t object to a textual representation
(function) [edit]
converts a tm object to custom textual representation
(function) [edit]
converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC)
(function) [edit]
converts time since epoch to calendar time expressed as local time
(function) [edit]
converts calendar time to time since epoch
(function) [edit]

[edit] Constants

number of processor clock ticks per second
(macro constant) [edit]

[edit] Types

calendar time type
(struct)[edit]
calendar time since epoch type
(typedef) [edit]
processor time since era type
(typedef) [edit]
(C11)
time in seconds and nanoseconds
(struct)[edit]

[edit] Synopsis

#define __STDC_VERSION_TIME_H__ 202311L
 
#define NULL /* see description */
#define CLOCKS_PER_SEC /* see description */
#define TIME_UTC /* see description */
 
typedef /* see description */ clock_t ;
typedef /* see description */ size_t ;
typedef /* see description */ time_t ;
 
struct timespec { /* see description */ };
struct tm { /* see description */ };
 
clock_t clock (void);
double difftime (time_t time1, time_t time0);
time_t mktime (struct tm * timeptr);
time_t timegm(struct tm * timeptr);
time_t time (time_t * timer);
int timespec_get(struct timespec* ts, int base);
int timespec_getres(struct timespec* ts, int base);
[[deprecated]] char* asctime (const struct tm * timeptr);
[[deprecated]] char* ctime (const time_t * timer);
struct tm * gmtime (const time_t * timer);
struct tm * gmtime_r(const time_t * timer, struct tm * buf);
struct tm * localtime (const time_t * timer);
struct tm * localtime_r(const time_t * timer, struct tm * buf);
size_t strftime (char* restrict s, size_t maxsize, const char* restrict format,
const struct tm * restrict timeptr);

Only if supported by the implementation:

#define TIME_MONOTONIC /* see description */
#define TIME_ACTIVE /* see description */

Only if threads are supported and it is supported by the implementation:

#define TIME_THREAD_ACTIVE /* see description */

Only if the implementation defines __STDC_LIB_EXT1__ and additionally the user code defines __STDC_WANT_LIB_EXT1__ before any inclusion of <time.h>:

#ifdef __STDC_WANT_LIB_EXT1__
typedef /* see description */ errno_t;
typedef /* see description */ rsize_t;
 
errno_t asctime_s(char* s, rsize_t maxsize, const struct tm * timeptr);
errno_t ctime_s(char* s, rsize_t maxsize, const time_t * timer);
struct tm * gmtime_s(const time_t * restrict timer, struct tm * restrict result);
struct tm * localtime_s(const time_t * restrict timer, struct tm * restrict result);
#endif
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