For restorehistory, BOL says [restore_date] is the Date and time of the completion of the restore operation. My test shows otherwise. it appears to be the start datetime of restore operation. Inspired by Steve's post, I came up with this script to show the actual completion datetime of database restore operation. The idea behind is SQL error log always contain the an entry of restore operation in the end of db restore. something like "Restore is complete on database 'my_database'. The database is now available."