What causes an invalid date?
An invalid date usually means that you did not use the correct format when you typed a date in. The program is Y2K compliant and now requires you to enter a 4 digit year (ex. 06/25/1999). Even if your computer only displays the 2 digit year, the program requires that you input all 4 digits. Another reason for an invalid date could be that the date does not exist (ex. 06/31/1999, 09/35/1999, etc).
