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mktime
[convert time to arithmetic representation]

    SYNOPSIS
    #include <time.h>
    time_t mktime(struct tm *timp);

DESCRIPTION
mktime assumes the time at timp is a local time, and converts its representation from the traditional representation defined by struct tm into a representation suitable for arithmetic.

localtime is the inverse of mktime.

RETURNS
If the contents of the structure at timp do not form a valid calendar time representation, the result is -1. Otherwise, the result is the time, converted to a time_t value.

COMPLIANCE
ANSI C requires mktime.

mktime requires no supporting OS subroutines.