You need to run the following query and it will give you the date of your SQL Server Installation. SELECT @@SERVERNAME SERVERNAME, CREATE_DATE ‘INSTALALTIONDATE’ FROM SYS.SERVER_PRINCIPALS WHERE SID = 0X010100000000000512000000 SID 0X010100000000000512000000 is belongs to user "NT AUTHORITYSYSTEM". This user create at the time of installation only. If you liked this post, do like on … Continue reading