I know. It’s strange. I tried net time /domain:domainname /set and it said it worked but didn’t work.
But I ran this little tool and it changed the registry values of the start and end dates for DST.
It says Windows 2000, but I also had one of my Server 2003 machines stuck on the bad time and this tool worked on that machine too.
These are the registry values it changes:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
ping