This ex-pdc used to get time from some internet sources to keep the domain with accurate time.
Event Type: Warning
Event Source: W32Time
Event Category: None
Event ID: 50
Date: 2/18/2013
Time: 9:30:37 AM
User: N/A
Computer: OLDPDCSERVER
Description:
The time service detected a time difference of greater than 5000 milliseconds for 900 seconds. The time difference might be caused by synchronization with low-accuracy time sources or by suboptimal network conditions. The time service is no longer
synchronized and cannot provide the time to other clients or update the system clock. When a valid time stamp is received from a time service provider, the time service will correct itself.
I have done these steps already but I keep seeing this event id on this now member server:
http://technet.microsoft.com/en-us/library/cc758905(WS.10).aspx
w32tm /config /update /syncfromflags:domhier
net stop w32time && net start w32time