"First Day Of Week" set to "System" doesn't work as expected

[leoheitmannruiz]

In Daily You "First Day Of Week" is set to "System" and my system region is set to Germany, with "First day of week" set to "Use default" (which I very much assume is Monday). Daily You shows Sunday as the first day of week.

I'm not sure how to test what my system says the default is. Do you know of any way? Etar (ws.xsoh.etar) has an option "Week starts on" and with it set to "Locale default" Etar shows Monday as the first day of week. So, I suppose at least one app is not behaving as intended?

Also, I'm fairly sure that in the past Daily You did show Monday as the first day of week for me..

This is Daily You 2.16.1 on GrapheneOS 2026011001.

All the best :)

[Demizo]

Interesting, I a observing the same issue. It does not seem to be respecting the "first day of week" system setting. If I change the system locale to German in Germany it uses Monday, but if I set the locale to English in Germany it uses Sunday. All regardless of system's "first day of week" setting. I do believe this used to respect the system setting. Hopefully this is not a regression in a dependency, I'll need to take a look.

[Demizo]

Unfortunately, I must have misremembered. It appears that Flutter explicitly does not follow regional settings at this time, see this issue. So there is nothing I can really do about correcting things like in-app date pickers.

I made a prototype for fetching the regional preference on modern Android versions. This sort of works in that I can make the regional preference take priority over the locale when set. However, this only works when an app specific locale is not set. I'll need to stew on this implementation for longer. For now it seems like an opportunity for an enhancement rather than a bug I can fully address.

[leoheitmannruiz]

Huh, it seems I misremembered too, then. Thanks for investigating!