A workaround that many blogs are telling readers is to change the Apple Watch region settings. But this is a pain in the a$$.
Over the last couple of weeks, Melissa Holt has come across a weird date and time bug that’s affecting users after updating to macOS High Sierra (or migrating to a new machine). In this Quick Tip, she’s got the details on how to squash this bug (and what you might look for if your problem persists).
Another hidden gem of a setting, you don’t even need to use the Terminal to change your date and time display preferences.