Whilst reviewing code on a SQL 2008R2 Instance I inspected the Date Last Modified of the System Stored Procedures of the databases. The ones in the DBO schema had a datetime that predates the installation however the ones in the dbo schema come later than the installation date. Specifically the machine was built December 2013 and the date of these SPs is 09/07/2014 17:16 (both for Date Last Modified and Create Date). The DB in question was also created December 2013.
Now I assume this was something benign, but how can I understand and determine what caused this date stamp?
I've checked the Windows logs but can't find any installations going on at that time.