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There is an easier way to set the time on you Apple Watch while in Airplane mode in IOS 12. On the iPhone turn Airplane mode on and also make sure Bluetooth is turned on . Next open the Settings App, select General and then Date & Time. Turn off Set Automatically. Select Time Zone and search for a city in that time zone. As an example search to Tokyo Japan. Select it and now the time will change on both the iPhone and Apple Watch. When you arrive back in the United States under Date and Time just turn back on "Set Automatically".