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  Name:     lastday() - get the last day in a month
  Usage:    <integer> = lastday(<date>)
  Params:   <date> - a date type variable
  Returns:  an integer equal to the last day in the month specified
            by the date variable.

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

                 ? lastday(ctod("08/19/89"))
                 * prints 31

                 ? lastday(ctod("01/01/80))
                 * prints 31

                 ? lastday(ctod("02/11/88"))
                 * prints 29