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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
Thanks! Yes, that would have been a good fix.
In the development app loader I have just pushed a new version of the bootloader, which contains a polyfill for toLocalIsoString - so now you should be able to use that even on firmware 2v14 and it'll be ok