Q: Get Date when a User added to a Active Directory Group - vb.net Example: 
I have few Groups in Active Directory: 


*

*Admin Group

*SOft Group

*Net group 


And few users like:


*

*Test1

*Test2

*Test3


The Test1 user is a member of all 3 groups. 
I want to find out when Test1 user was added to group Admin Group.

A: Take a look at msds-replvaluemetadata attribute. The attribute stores all group members with date and domain controller where the change occurred. https://blogs.technet.microsoft.com/pie/2014/08/25/metadata-2-the-ephemeral-admin-or-how-to-track-the-group-membership/
