problems with the "Date Created" Metadata in Adobe Bridge

Hi everyone.

I am currently working on an electronic photo library for our organization.  Part of my mandate is to add a Date Created metadata on all the photos since it is very important to know when the photo was taken.  Some photos were dated since 1980s.  Since we do not have the digital version of the old photos, we end up scanning these and, in effect the date specified on the "Date Created" was the date it was scanned.

I have the date of some of the old photos when it was taken, but for some, I only have the month and the year (sometimes, just the year).  Inventing a day and a month is not an option.

Is it possible to enter a month-year or just the year on the Date Created field under Metadata?

I appreciate your help.

Thanks,

.m.u.r.d.o.c.h.