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     The time function returns the number of seconds elapsed since
     00:00:00 Greenwich mean time (GMT), January 1, 1970, according to
     the system clock. The system time is first adjusted according to
     the timezone system variable. (See tzset for a description of this
     variable.)
 
     The return value is stored in the location given by <timer>. This
     parameter may be NULL, in which case the return value is not
     stored.
 
     Return Value
 
     The time function returns the time in elapsed seconds. There is no
     error return.
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