the time goes forward 5 minutes each week

Thinking about that, I wonder whether something could be added to https://banglejs.com/apps/?id=widadjust to allow it to figure out the drift using GPS.

It would be pretty nice if it had some means of measuring its own drift. Years ago I wrote my own clock drift corrector for a HP 50g graphing calculator, though instead of using GPS it was just based on my periodically entering the correct date and time and manually pressing a button right on the second, at which point it would calculate the corresponding drift. Just a couple of iterations of this quickly made it more accurate than a $50 quartz Timex watch. :)

If there was a way for the app to receive an event when connecting to the App Loader and updating the date/time, it could then compare the new value to the current clock along with the last known date/time of adjustment in order to determine the drift itself.