I think that my banglejs2 synchronizes to my android phone's time when connecting to Gadgetbridge. The A-GPS data tip was for getting a GPS fix. I suppose that you need "GPS Time" to sync to the GPS time or "GPS auto time" to synchronize every time you get a GPS fix.
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.
So, just downloading that should help?
Or is it in combination with GPS time?