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  Name:     checktime() - check if time string is valid
  Usage:    <logical> = checktime(<time>)
  Params:   string <time> in the format "HH:MM:SS"
  Returns:  .T. if the time is within valid time range, otherwise .F.

 ---------------------------------- Example ---------------------------------

                 mtime = "  :  :  "
                 @ 10,0  say "Enter time:"
                 @ 10,13 get mtime valid checktime(mtime)
                 read