`<time.h>`

`_strdate`	Converts current date to string.
`_strtime`	Converts current time to string.
`asctime`	Converts date and time to ASCII.
`clock`	Determines processor time.
`ctime`	Converts date and time to a string.
`daylight`	Indicates whether daylight saving time adjustments will be made.
`difftime`	Computes the difference between two times.
`gmtime`	Converts date and time to Greenwich mean time (GMT).
`localtime`	Converts date and time to a structure.
`mktime`	Converts time to calendar format.
`stime`	Sets system date and time.
`strftime`	Formats time for output.
`time`	Gets time of day.
`timezone`	Contains difference in seconds between local time and GMT.
`tzname`	Array of pointers to time zone names.
`tzset`	Sets value of global variables daylight, timezone, and tzname.