I would have done it if it was possible, but unfortunately it just doesn't seem to be.
To be fair, the GPS does exactly that - storing the time (accurately) as long as there is some battery left. You just need to have let it get a fix first.
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.
I would have done it if it was possible, but unfortunately it just doesn't seem to be.
To be fair, the GPS does exactly that - storing the time (accurately) as long as there is some battery left. You just need to have let it get a fix first.