time---get current calendar time (as single number)
#include <time.h> time_t time(time_t *t);
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
-1 result means the current time is not available; otherwise the
result represents the current time.
ANSI C requires
Supporting OS subroutine required: Some implementations require
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