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At some point someone will ask you for metrics about your SQL Servers. Why do you want to track the installation date? If you already collect the above information and the date SQL Server was installed, you can show more information about your SQL environment, leverage it to show trends and even present it to management as an argument for hiring more DBAs. You may want also opt to use one of the SERVERPROPERTY values. SERVERPROPERTY also has a parameter that will allow you to return the edition, which may be useful for reporting on, especially if there is to be a consolidation project.