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  Name:     checkdate() - check if date string is valid
  Usage:    <logical> = checkdate(<date>)
  Params:   string <date> in the format "MM/DD/YY"
  Returns:  .T. if the date is within valid date range, otherwise .F.

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

                 mdate = "  /  /  "
                 @ 10,0  say "Enter date:"
                 @ 10,13 get mdate pict "  /  /  ";
                        valid checkdate(mdate)
                 read