>- Listen for print-screen commands and swap things to relative dates. (I have no idea if this is possible. I actually would be that it isn't, but maybe it should be.)
If it were, a lot of people would immediately (ab)use it to make screenshots impossible. You might consider that a positive or a negative, depending on your perspective.
Edit: although, on a Mac if you listened for `Cmd` or `Shift` you'd catch the print screen command. And I don't think anyone would complain that the dates changed on Ctrl press.
Of course you might still be screwed on other OSes.
If it were, a lot of people would immediately (ab)use it to make screenshots impossible. You might consider that a positive or a negative, depending on your perspective.