Sql Server script to find installation date, time and Authentication mode

 SELECT
    createdate AS InstallationDate

    ,CASE SERVERPROPERTY('IsIntegratedSecurityOnly')  

        WHEN 1 THEN 'Windows Authentication' 

        WHEN 0 THEN 'Windows and SQL Server Authentication' 

    END AS AuthenticationMode

    ,SERVERPROPERTY('servername') AS ServerName

FROM master.sys.syslogins

WHERE name LIKE 'NT AUTHORITY\SYSTEM'