mktime---convert time to arithmetic representation
#include <time.h> time_t mktime(struct tm *timp);
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
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
ANSI C requires
mktime requires no supporting OS subroutines.
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