STOD(<C date string>)
 Converts a date string to date type.
 Returns <expD> date type of <date string>.

 <date string> is in the format "YYYYMMDD".

 Returns a blank date if <date string> is invalid

 * Date string from calculations may be invalid
 m_datestr = STR(  YEAR(DATE())            ) +;
             STR( MONTH(DATE()) + m_months ) +;
             STR(   DAY(DATE()) + m_days   )

 * Date type is blank if date string is invalid
 date_type = STOD(m_datestr)

 * Date type is valid even if date string is invalid
 date_type = STOD( MAKEDATE(m_datestr) )


             Placed in the Public Domain by Tom Rettig Assoc.