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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
malaire
An easy and universal way to make regular updates is to create a widget that will sort of a backgroung job. It will get data from a time server and set the watch RTC. Then any watchface will get the correct time.
Probably you do not have to even to create it. As DDDanny wrote
that the Android/Gadgetbridge TimeSync after connect works like a charm.
Some people here is working on a connectionless (ads based) way of time synchronizing with jitter < 10ms. Is it what you need?