Hi Saurabh,
You are affected by the following
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCue02482
Symptom:
When logging in to Cisco Unified CM Administration Webpage:
GUI displays:
Last Successful Logon: Wednesday, December 31, 1969 7:00:00 PM EST
Date/Time does not change even after additional updates.
Conditions:
* Observed in CUCM 9.0.1.10000-37 and CUCM 9.1.1.10000-11
* LDAP authentication enabled
It is not fixed yet, so you need to wait for the fix.
HTH
Manish