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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
Great! There's already a DCF77 module for Espruino here as well: http://www.espruino.com/DCF77
Having said that, I found my module to have very bad reception when in the house and it only got the time occasionally... I think in my case it was all the interference caused by WS2811 LEDs though - using epaper would be much better.
GPS sounds great though, and potentially (it's a bit of a hack) you could work out how far off Espruino's clock was relative to GPS and could then just multiply or divide it.