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8.9 time—get current calendar time (as single number)

Synopsis 

     #include <time.h>
     time_t time(time_t *t);

Description
time looks up the best available representation of the current time and returns it, encoded as a time_t. It stores the same value at t unless the argument is NULL.
Returns
A -1 result means the current time is not available; otherwise the result represents the current time.
Portability
ANSI C requires time.

Supporting OS subroutine required: Some implementations require gettimeofday.