My Gear S3 Frontier (SM-R760) has the same problem. There is no Settings/Device/Date and Time section on the menu, the time DOES NOT sync with the phone, Gear app does not have a way to change time manually neither and so, I have no way to change the time on my watch accordingly to the season.
As shown off by Ars Technica, side-loading apps to the Galaxy Gear isnβt particularly difficult. All you need to do is enable USB debugging in the settings, hook up to a computer and use Android
Samsung Gear S3 Frontier Design and Specs. The Gear S3βs 1.3-inch super AMOLED display has more room for apps than you might expect, when compared to square smartwatches. The circular bezel lets you quickly navigate through apps, scroll through messages, and even answer calls. One twist left shows you all notifications, and one twist right
The Gentleman β $0.99. This classic style watch face is created by BERGEN, one of the top sellers of watch face themes for Samsung smartwatches. The Gentleman also works for the Gear S2 and the Gear S2 Classic. Its functions include the 12-hour Mode, day-date-and-month, step percentage, and battery level.
Don't shoot me but aside from the lack of app support tizen is actually the better os imo. Just in terms of reliability and random bugs. WearOs is much more fluid than Android Wear but I still think tizen is more fluid and bugfree. I think the assistant is Google's best asset tbh the app support isn't that great.
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galaxy gear s3 frontier apps