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FilledSmallSquare$InstallationDate gives the date and time at which the copy of the Mathematica kernel you are running was installed.

FilledSmallSquare$InstallationDate is in the form year, month, day, hour, minute, second returned by Date.

FilledSmallSquare See The Mathematica Book: Section 2.13.5.

FilledSmallSquare See also: $CreationDate.