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                                 L_ISDVALID()


Syntax:        L_ISDVALID(<expD>)


Purpose:       To test whether a date is valid.


Arguments:     <expD> is a date type variable.


Returns:       A logical (.T.) if the date is valid else returns a
               logical (.F.).


Usage:         In validation routines.


Examples:      ? L_ISDVALID(CTOD("29/02/89"))   && Result: .F.
               ? L_ISDVALID(CTOD("29/03/89"))   && Result: .T.


Notes:         If a null date is used the result will be a logical
               (.F.)


Language:      Clipper