Edit a contact, and click to add a birthday event.
Select a date and press OK
Notice you're taking to the contact screen, but the date is one day what you selected.
Example:
I select February 20, 1982 and press OK
The field now shows February 19, 1982
Interestingly, when you save the contact, the correct date is shown in the field. That is, February 20, 1982
Select a date and press OK
Notice you're taking to the contact screen, but the date is one day what you selected.
Example:
I select February 20, 1982 and press OK
The field now shows February 19, 1982
Interestingly, when you save the contact, the correct date is shown in the field. That is, February 20, 1982