Have you ever forgotten how may days are in a month?  If you or a user incorrectly enters a date, MS Access displays an unfriendly, unhelpful error message.  The Make Valid Date function will correct your mistake before MS Access even knows you've typed it in. 

Example: If a user types in the invalid date of  4/31/98, the Make Valid Date function automatically changes it to the valid date of  4/30/98.