SQL_ME_RICH (11/23/2012)
Is there a query that I could run against some of the system objects that would retrieve a time/date stamp for me of when the Isolation Level was set or changed?
Nope, because isolation level is a connection-specific setting.
If you mean when READ_COMMITTED_SNAPSHOT was enabled, that should have gone into the error log, but if you don't keep a lot of those that may not help.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability