I work for a governmental organization that in case of a missing birth date records only the year and sets month and day to 0 (e.g. 1972-00-00). This, at first

I work for a governmental organization that in case of a missing birth date records only the year and sets month and day to 0 (e.g. 1972-00-00). This, at first sight, reasonable workaround from a user's point of view has some unanticipated ramifications when you search for a person. Those month- and day-less are born on each day of a year ...