SQL Server Evaluation Edition is available free of cost. It’s a trial version & valid for limited time of period. The expiration date is always 180 days from the initial installation date.
The following query will give you the expiration date of evaluation instance :
DATEADD(DD, 180, CREATE_DATE) AS ‘EXPIRY DATE’
WHERE SID = 0X010100000000000512000000
SID 0X010100000000000512000000 is associated with login "NT AUTHORITYSYSTEM" & which is created at the time of installation only.
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Reference : Rohit Garg (http://mssqlfun.com/)