My Camera Clock Was Wrong. Can I Fix the Photos?
Yes. Shift the whole batch by the same amount, which is exactly how a wrong clock behaves.
A wrong camera clock is the easy case, because every photo is wrong by the same amount. Work out the offset from one photo you can date another way, then apply it to the batch.
Time zones are the same shape of problem: a whole trip out by a fixed number of hours, correctable in one move.
Takeout JSON Metadata Fixer can shift a selection by a set amount and writes the corrected value into every file. It runs on your own computer and is free for your first 500 photos.