Unable to add birthday in a contact

  1. Open an existing contact
  2. Click Edit —> Add Birthday
  3. Select Date and Save
  4. Close the contact app
  5. Come back to the same contact, the birthday is gone.

You might have better luck asking this question over in Apple Support Communities run by Apple Support.

I tested on MacOS 11.6. It works. Are you sure you entered date in the correct format ?

Unable to add birthday in a contact
 
 
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