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.TH TIME 3 .SH NAME time - determines the current calendar time .SH SYNOPSIS #include <time.h> time_t time(time_t *timer) .SH DESCRIPTION The .BR time () function determines the current calendar time. .SH RETURN VALUE The value returned is the best approximation to the current calendar time. The value .B (time_t)-1 is returned if the calendar time is unavailable. If .I timer is not a null pointer, the return value is also assigned to the object it points to. .SH STANDARDS ISO/IEC 9899:1999 Section 7.23.2.4 Paragraph 1,2,3 .SH SEE ALSO .BR time.h (3)