Salute data redditaque! I am using -MacBook Pro (2.33 GHz Intel Core 2 duo) - MacOS X 10.5.6 - iTunes 8.0.2 - Address Book 4.1.1 - iPhone 3G 16Gb - iPhone Software version 2.2 Problem =1= I add on my iPhone a contact and try to enter her birthday 05 July 1937 The day wheel spins back to 01 This problem only rises with the date 05 July 1937 The program will accept 05 July 1938 or 05 July 1936, or 05 Jun 1937, etc. Problem =2= I add on my iPhone two Contacts, one with birthday 20 May 1931 the other with birthday 01 Jul 1937 Later on, I connect my iPhone to my MacBook Pro. iTunes syncs with Address Book (and with iCal) on my MacBook Pro Birthdays found in Address Book (and in iCal) on my MacBook Pro: 19 May 1931 30 Jun 1937 Why was a day substracted (or added, depending on your standpoint)? To solve the problem, I changed the dates in my Address Book on my Mac, synced my data with the iPhone, and the correct dates show in Contacts on my iPhone. To test the system, I change the 05 July 1937 date to 05 July 1938, and then try to set it back to 05 July 1937. Again: the day wheel spins back to 01 (see problem =1=). Is this a bug in the system, or is my iPhone the only victim? Pax tibi!