Several Users have come across a warning message in their web database that says: "Your Local Machine Time Zone does not match your current Sharepoint Regional Settings. Operations involving dates will not work correctly."
Users are getting this message even after correctly specifying and changing the timezone in their Sharepoint Settings. This is a common problem across the net, but we've found a workaround that will eliminate this problem.
Step 1: Open your Web Database in your Browser
Step 2: Click the Arrow Under the Login ID (upper right corner)
Step 3: Choose My Settings
Step 4: Click the My Regional Settings Link
Step 5: Uncheck the 'Always Follow Web Settings' check and specify your time zone.
Step 6: Click OK
This should eliminate the warning message.
I did it and doesn´t work !!! I am sure that I did correctly !