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

Standard library header <ctime> - cppreference.com

This header was originally in the C standard library as <time.h>.

This header is part of the C-style date and time library.

Macro constants number of processor clock ticks per second
(macro constant) [edit] implementation-defined null pointer constant
(macro constant) [edit] Types process running time
(typedef) [edit] unsigned integer type returned by the sizeof operator
(typedef) [edit] time since epoch type
(typedef) [edit] calendar time type
(class) [edit] time in seconds and nanoseconds
(struct)[edit] Functions Time manipulation returns raw processor clock time since the program is started
(function) [edit] returns the current time of the system as time since epoch
(function) [edit] computes the difference between times
(function) [edit] returns the calendar time in seconds and nanoseconds based on a given time base
(function) [edit] Format conversions converts a std::time_t object to a textual representation
(function) [edit] converts a std::tm object to a textual representation
(function) [edit] converts a std::tm object to custom textual representation
(function) [edit] converts time since epoch to calendar time expressed as Universal Coordinated Time
(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] Synopsis

#define NULL /* see description */
#define CLOCKS_PER_SEC /* see description */
#define TIME_UTC /* see description */
 
namespace std {
  using size_t = /* see description */;
  using clock_t = /* see description */;
  using time_t = /* see description */;
 
  struct timespec;
  struct tm;
 
  clock_t clock();
  double difftime(time_t time1, time_t time0);
  time_t mktime(tm* timeptr);
  time_t time(time_t* timer);
  int timespec_get(timespec* ts, int base);
  char* asctime(const tm* timeptr);
  char* ctime(const time_t* timer);
  tm* gmtime(const time_t* timer);
  tm* localtime(const time_t* timer);
  size_t strftime(char* s, size_t maxsize, const char* format, const tm* timeptr);
}

[edit] Class std::timespec [edit] Class std::tm

struct tm {
  int tm_sec;
  int tm_min;
  int tm_hour;
  int tm_mday;
  int tm_mon;
  int tm_year;
  int tm_wday;
  int tm_yday;
  int tm_isdst;
};

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