Ever finished a project and got a phone call within a few days that something was broken… or that someone was stating that it never worked in the first place? And of course no one has modified anything, etc.
I’ve experienced this a couple of times now and in most cases the cause was related to a change in a GPO which the customer made… trust me when I say that things like these can take a lot of time to troubleshoot 
So, nowdays whenever I finish a project I run the following PowerShell code to provide me a with a list of all the group policy objects and the date they’ve been changed for the last time (and some additional info because it may come in hand in the future):
Get-GPO –All | select DisplayName, DomainName, Owner, Id, GpoStatus, ModificationTime | format-table | convertto-html | out-file D:\Temp\GPOObjects-Report.html
Handy, right? 
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