I had the same problem with my camera’s timestamp (on-screen clock) showing the wrong time (-2 hours) as if they were in Pacific time while I am in Central (US). Even after hitting the time sync button in the app, it stayed 2hrs behind my iPhone’s time.
To fix this, I had to change my iPhone’s timezone manually to something else (I chose Bermuda/Atlantic, +2 hrs from me), then used the time sync button in the app. That correctly changed the time ahead 4 hrs from where they were. Then I changed my phone back to auto timezone (back to central) and did another time sync. That fixed the problem.
Seems like a very fixable bug.