I have both CallManager 4.1.3 and 4.2.3 installed. I have followed the Windows OS updates and the CallManager updates and time is reflected just fine on the 7940/7960/7941/7961/7970 IP phones across my network and on the CallManager servers as well. Time is also correct on my PC.
Now can anyway tell me why my Cisco IP Communicator is showing the incorrect time? I am running version 220.127.116.11.