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@DerGuteWolf
I would suggest adding to the language selection in the language app a selection for the timezone and saving the next few changeover dates together with the amount of change together with the locale stuff.
custom.html could use https://momentjs.com/downloads/moment-timezone-with-data-10-year-range.min.js .
Usage: moment.tz.names(); would give all timezone names to select from (or two step selection with moment.tz.countries() and moment.tz.zonesForCountry(String); ), moment.tz.zone(String) gives the zone data for a selected name.
Either upload this zone data directly or use the packed format: https://momentjs.com/downloads/moment-timezone-utils.js provides moment.tz.pack(UnpackedZoneData)
From https://github.com/moment/moment-timezone/blob/d7f687ea598b205806decd83b78d3ea9ad11a569/moment-timezone.js#L48 to https://github.com/moment/moment-timezone/blob/d7f687ea598b205806decd83b78d3ea9ad11a569/moment-timezone.js#L136 is the code needed on the Bangle.js to unpack data.