iOS 5, iPhone 4S and calendars

[Lyn2012]

Has anyone else noticed that when a birth date is included in the Contacts list, it no longer shows in the Calendar app on the correct date. For example my friend's birthday is 21 October, but the Calendar app shows her birthday as today, 20 October. When I check in the Contacts app, it is still input correctly as 21 October and looking on my iPad, (still running 4.3.3), her birthday shows as tomorrow, 21 October in both Contacts and Calendar apps.

Is this an iOS 5 bug?

 

[Pravius]

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

Time zones all set the same?

 

[Lyn2012]

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

Time zones all set the same?

How do I check this? Time zone is set globally, no alerts set for birthdays and when I look at the Calenders, there is one titled "Birthdays", but I am not allowed to edit it.