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DATESERIAL Function Details
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 DATESERIAL(year%, month%, day%)
 
 Usage Notes
   ■ Arguments outside valid ranges are evaluated to calculate a valid date.
     For example:
 
         TheDate = DATESERIAL(92, 13, 1)
 
     where the argument month% (13) evaluates to the first month of the next
     year (January 1, 1993).
 
   ■ Specifying arguments that return a serial number outside the valid range
     (-53,688 to 65,380) produces the Visual Basic error message, "Illegal
     function call." Note: This translates to an actual date range of January
     1, 1753 to December 31, 2078, inclusive.
 
   ■ You can use negative numbers as arguments. For example, to find the
     serial number for the date one week before 9/1/92, you can use:
 
         DATESERIAL(92, 9, 1-7)