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Following are the important functions, which we use while working with date and time in C or C++. All these functions are part of standard C and C++ library and you can check their detail using reference to C++ standard library given below.
| SN | Function & Purpose |
|---|---|
| 1 | time_t time(time_t *time); This returns the current calendar time of the system in number of seconds elapsed since January 1, 1970. If the system has no time, .1 is returned. |
| 2 | char *ctime(const time_t *time); This returns a pointer to a string of the form day month year hours:minutes:seconds year\n\0. |
| 3 | struct tm *localtime(const time_t *time); This returns a pointer to the tm structure representing local time. |
| 4 | clock_t clock(void); This returns a value that approximates the amount of time the calling program has been running. A value of .1 is returned if the time is not available. |
| 5 | char * asctime ( const struct tm * time ); This returns a pointer to a string that contains the information stored in the structure pointed to by time converted into the form: day month date hours:minutes:seconds year\n\0 |
| 6 | struct tm *gmtime(const time_t *time); This returns a pointer to the time in the form of a tm structure. The time is represented in Coordinated Universal Time (UTC), which is essentially Greenwich Mean Time (GMT). |
