If you change the date on the underlying Operating System that your TSM Server is running on you will need to run the ACCEPT DATE command. If TSM is up when the date change occurs then you can login to the TSM Server using the Admin CLI or TSM Studio ( example at the end of this article) and run the ACCEPT DATE command.

If your server was down and your windows TSM Server service will not start. Check the event log or console messages for the following error

TSM Server Error: Server: SERVER_NAME ANR0110E An unexpected system date has been detected; the server is disabled. Verify the system date and use the ACCEPT DATE command to establish the current date as valid.

If you are unable to access the server from the ADMIN CLI then go to the command prompt or unix shell, change to the directory where dsmserv.exe (just dsmserv on unix) is installed and run it. When you see the above message enter ACCEPT DATE and once the new date has been accepted run the HALT command to stop TSM and start the TSM Server in the normal way for that Operating System.

Why do you need to do this

If someone has accidentally changed the Operating System date to a future date and the expiration process runs then a lot of data could be lost.
If you can access the TSM Server from TSM Studio then goto to the COMMANDS menu and select ACCEPT DATE