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mktime
======

Syntax
------

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

Description
-----------

This function converts a time structure into the number of seconds since
00:00:00 GMT 1/1/1970.  It also attempts to normalize the fields of
TPTR.

Return Value
------------

The resulting time, or -1 if the time in TPTR cannot be described in
that format.