Timestamps on photos are no more legally accepted than metadata these days. Since photoshop, one can insert any date they want, so it's not super reliable as evidence that a photo was taken on the date the time stamp indicates.
What's to say you get the tweak you're looking for, set your clock to a year ago when you moved into your rental, take a pic showing it's trashed, then say "look the timestamp says it was from the day I moved out!" ... nobody's going to buy that. Even in the old days where film cameras did that, you simply change the date. It's definitively never been and never will be anything "official"