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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
Yes, there is! Someone asked this a week ago about the Puck (which has the same chip) so the answer there might help: http://forum.espruino.com/conversations/326756/#comment14462460
In terms of accuracy it's about 20 parts per million I believe. Realistically most on-chip RTCs even with separate crystals end up around that as that's what a lot of the crystals are rated at.
The DS3231 that you can add on is significantly better though at around 2ppm though.