NTOD(<N year>, <N month>, <N day>)
 Converts numeric date parameters to date type.
 Returns <expD> date type of <year>, <month>, and <day>.

 Negative parameter values are converted to positive.

 Returns blank <expD> if syntax error.

 Makes valid date from invalid parameters.  For example,
 <day> of zero becomes last day of previous month, each
 multiple of twelve months increments the year and
 subtracts twelve from itself.

 * Date from calculations may be invalid
 m_date = CTOD(STR(  YEAR(DATE())            ) +"/"+;
               STR( MONTH(DATE()) + m_months ) +"/"+;
               STR(   DAY(DATE()) + m_days   ) )

 * Date from calculations is valid
 m_date = NTOD(  YEAR(DATE())           ,;
                MONTH(DATE()) + m_months,;
                  DAY(DATE()) + m_days   )


             Placed in the Public Domain by Tom Rettig Assoc.