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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/algorithm/../header/../../c/header/time.html below:

Standard library header <time.h> - cppreference.com

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 converts a tm object to a textual representation
(function) [edit] 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 [edit] Types [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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