The gettimeofday() function gets and the settimeofday() function sets the system's notion of the current time. The current time is expressed in elapsed seconds and microseconds since 00:00 Universal Coordinated Time, January 1, 1970. The resolution of the system
clock is hardware dependent; the time may be updated continuously or in clock ticks.
The tp argument points to a timeval structure, which includes the following members:
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long tv_sec; /* seconds since Jan. 1, 1970 */
long tv_usec; /* and microseconds */
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If tp is a null pointer, the current time information is not returned or set.
The TZ environment variable holds time zone information. See TIMEZONE(4).
The second argument to gettimeofday() and settimeofday() is ignored.
Only the super-user may set the time of day.
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