Due to problem on our end we have about 13 000 contacts with "01.01.1970" as their birthday. I'd like to remove that from all those contacts, and tried doing that by using "Batch Update via Profile". I made a simple profile with only birth date, but it doesn't seem to work.
Firstly I have to manually type in the birth date (calender drop down doesn't work), and using the copy button doesn't work. Changes are not saved either.
Does anyone know of another way to mass edit birth dates, or does anyone know how to fix this bug? I'm quite new at CiviCRM so I might have done something wrong.