Need help with SQL statment

I need some help with this SQL statment.

I would like to set up and automated task so that it will delete archived messages older that 60 days. I am running openfire 3.6.2 and SQL Express 2008.

I have tried a few different statments like the following.

select * FROM ofMessageArchive
where sentdate > (CURRENT_TIMESTAMP-5184000)

If any one could help me figure this out, it would be greatly appreciated.