I just did this. My inspiration was this though (https://ldapwiki.com/wiki/IDM%20Tricks).
Now searching for a way to modify timestamp I found this great tip, that would save me time if I found it earlier.
I used timestamp to report on users who have not changed some attributes in a certain amount of time.
Now I want to test my implementation and I am wondering if there is some way to change the value of timestamp (like back in time). I know very counter intuitive, but still, I want to test that the implementation is working...