C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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mktime
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <time.h>
 
  Syntax:    time_t mktime( struct tm *timeptr );
 
  Returns:   the encoded calendar time if successful, or -1 if not.
 
  See also:  time, asctime, gmtime, localtime
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