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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.
@Gordon
I'd definitely recommend that you go with the Espruino MDBT42Q module that @allObjects mentioned - it's low power, has a reasonably accurate clock, and even if you don't use the Bluetooth it's a nice easy way of setting the time correctly.
The Pico is a little smaller but while it is faster it's not quite as power efficient, and it's also the only official Espruino board that lacks an accurate clock - which could make life tricky for you.