WITH 
Base
     AS (SELECT Db_name(database_id) DatabaseName,
                last_user_seek       AS last_access_time
         FROM   sys.dm_db_index_usage_stats
         UNION ALL
         SELECT Db_name(database_id) DatabaseName,
                last_user_scan
         FROM   sys.dm_db_index_usage_stats
         UNION ALL
         SELECT Db_name(database_id) DatabaseName,
                last_user_lookup
         FROM   sys.dm_db_index_usage_stats
         UNION ALL
         SELECT Db_name(database_id) DatabaseName,
                last_user_update
         FROM   sys.dm_db_index_usage_stats),
AccessInfo
     AS (SELECT DatabaseName,
                Datediff(dd, Max(last_access_time), Getdate()) AS no_of_days
         FROM   Base
         GROUP  BY DatabaseName
         HAVING DatabaseName NOT IN ('master', 'tempdb', 'model', 'msdb'))
SELECT *
FROM   AccessInfo
where no_of_days > 15
ORDER  BY 2;

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

We walk in the dark places no others will enter
We stand on the bridge and no one may pass