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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.
cwilt
@Gordon
Well, the chip has an internal RTC. It's supposed to be really pretty accurate, and I believe the STM32 is used in things like the pebble smartwatch and the original Sony smartwatch without an external RTC.
I think a lot of it comes down to the crystal used - the ABS06-107 only seems to be 20ppm, where the DS3231 is 2ppm though.