Removing only birth years from a group in my Address Book

A lot of my contacts (600+) had somehow got their birth years set to 2000. Their birth months and days are correct, but the 2000 is wrong.

With the tremendous help I got here, I was able to get them in one group (which I called 2K).

I would like to remove the birth years from those cards, while retaining birth months and days.

On my OS X 10.8.5 it can even be done manually, but not on adayzdone's 10.6.8.

Can anybody provide a script (for 10.8.5)?

So, I would like to turn

into

using AppleScript rather than doing it manually. And not just November 10.

Solution 1:

Ok. Since you have your group already you group.

set targetGroup to "BD" 
tell application "Contacts"
    set thePeople to people of group targetGroup
    repeat with i from 1 to number of items in thePeople
        set this_item to item i of thePeople
        set thisDate to birth date of this_item
        set year of thisDate to 1604

        set birth date of this_item to thisDate
        save
    end repeat


end tell

I tried to set the year to "" . But it changes the whole date. day and month to something else.

So I checked what a yearless birth date 'date' looked like and they all had 1604 in the year position.

setting the year to this seems to work.