The Birthday field displays the Customer's Birthday in MM/DD (no year) format and may be entered the same way.
For example, if the Customer's birthday is October 30, enter 10/30.
The Birthday field may be used for any date where the year is irrelevant.
Technically, the year 2000 is assigned to all Birthdays but is not displayed or printed (the year is used internally when sorting Birthdays).
Note: When using the Birthday field in a Report or Label filter the year must be included. For example, to print Mailing Labels for all Customers who have April birthdays, enter >033100 AND <050100 in the Filter Condition field.
See:
Customer Database - More Data Screen Fields