Brandon here from the Apple MobileMe support team. I understand you are experiencing with the timezone and date format settings on your Mobile Me account. I understand how frustrating this can be, and i sincerely apologize for any service outages.
This is a result of a temporary issue stemming from the .Mac to MobileMe transition. Apple is working to identify the issue and expects to resolve it shortly. I apologize for any inconvenience this may cause.
The MobileMe System Status will be updated once this is resolved. For your convenience, the MobileMe System Status is always available on these pages:
http://www.me.com
http://www.apple.com/support/mobileme/ww
If you are still having difficulty with the timezone and date settings after System Status indicates the issue has been resolved, please reply to this message with a detailed description of the issue, the full text of any error message or alert you received, and a description of any troubleshooting steps you've taken.