This is probably going to be extremely vague but on a trip to Orlando on SouthWest a few years back they had a selection of movies on board. It was Japanese and I was enjoying it a lot but forgot to get it's name jotted down and never did get to finish it. I think it was about time travel, a watch and him either going back in time or into the future. Or it could have even been about turning younger or older. I hate that I'll probably never finish it or I doubt anyone knows what' it is. I even looked up "Japanese Time Travel movies with a watch." And none of the titles sounded familiar.
Now that I think about it it could have even been about changing his attitude whenever he put on the watch maybe? Or he turned invisible? Now I'm just making stuff up cause I can't remember it to the fullest.
If anything vaguely sounds familiar to this, thank you!