Date stamped photos aren't really valid evidence as it's easy to change the settings on the camera/phone to change the date. You need other evidence alongside, i.e. countersigned by the tenant on moving in, or an affidavit/witness statement by a third party as to state, i.e. from previous tenant moving out - just something else to prove the date.
OP, did you take any photos when you moved out showing the condition of the property, or did you take any photos when you moved in showing any damage? Or any family photos of birthdays, christmas, etc., which shows the state of the property in the background? Presumably you only had access to the property during your tenancy, so any photos you took must, by default, have been taken during your tenancy, which can help, but obviously not definitive.
Or photos from Rightmove or the estate agent when it was being marketed for rent/sale at any point showing the condition before, during or after your tenancy?
Almost certainly, your landlord is trying it on and will be laughed out of court, but anything at all that you have to help prove your assertion that you didn't do the damage will help. Please don't just assume that the court will laugh at him because of the deposit and no "proof" of you doing the damage - nothing is ever certain in legal issues. You need to fight back with whatever you can cobble together.