Share your experience!
Problem with clock on my Xperia Mini Pro is that i have two clocks... the big one ,and small on the top of the screen. The big clock is correct,but small is lating.When i reboot my phone,the big and small are same,but next minute the small clock stay at that time when big one going well... I think that this problem is because ICS 4.0.4 update.Sorry for my bad english.
Settings > apps > all > clock / Clocks > clear data
See if you face the same problem
I could also suggest trying, Menu > Settings > Date & Time > tick Automatic date and time and Automatic Time Zone.
Let us know how you get on.