I have a problem with sync my contacts. I sync my contacts on a iPhone 4 with Windows Contacts via iTunes program.

If I have a contact in Windows Contacts (C:\Users\<my username>\Contacts) with the birthday 4th April1972 I get on the iPhone the 3rd April 1972.

I the contacts of Windows the birthday is saved as date + time. If this time is set to 00:00:00 the iPhone displays the 3rd April 1972. if I set the time to 01:00:00 the iPhone displays the right birthday: 4th April 1972.

I my point of view it's a bug og the iPhone.