The headline actually says most of it. It would be handy if the timestamp could be filtered.
Can you explain the intended use case a bit?
Today I was looking for something I knew I "clipboarded" 5 days ago. At the end I found it somehow but a time stamp would have been helpful.
Well, you found it anyway, so evidently it wasn't needed after all. :) When we weigh the pros and cons of something like this, we have to balance the negatives of information overload and a more complicated layout against the positives of additional information. I don't think the balance would be worth it in this case. Thanks for the idea anyway, though!