Searching for passwords not changed since date

I would like to search for all the passwords I have not changed since a particular date. How do I do that?

(Hacks that involve python snippets to search through json export files are fine. I’m a programmer in real life.)

Motivation: I want to find all the passwords I haven’t changed since I imported from LastPass (as I now regard those passwords as potentially compromised).

We are told the ability to sort by date is coming to the web vault client soon. If you scroll through the feature request thread I linked, you’ll find a few simple work-arounds based on CLI commands.