[Bug]: Custom snooze calendar always starts the week on Sunday #12737

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1. Wiktor102

   added

   bugSomething is broken or behaving incorrectly.Something is broken or behaving incorrectly.

   needs-triageIssue needs maintainer review and initial categorization.Issue needs maintainer review and initial categorization.

   on Sep 20, 2026
2. juliusmarminge

   added

   acceptedfeature request acceptedfeature request accepted

   via-triageFiled through npx t3 triageFiled through npx t3 triage

   and removed

   needs-triageIssue needs maintainer review and initial categorization.Issue needs maintainer review and initial categorization.

   on Sep 20, 2026
3. juliusmarminge commented on Sep 20, 2026

   

   juliusmarminge

   on Sep 20, 2026

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   Thanks for the report — this is a real cosmetic bug in the web custom-snooze date picker.

   The calendar is DayPicker (@daypicker/react v10) wrapped in apps/web/src/components/ui/calendar.tsx and used only from apps/web/src/components/CustomSnoozeDialog.tsx (Snooze → Custom… → date popover). That wrapper never sets locale or weekStartsOn. DayPicker’s default is en-US, so the grid always starts on Sunday. The trigger label already uses toLocaleDateString, which is why the field text can look localized while the weekday row does not.

   Mobile custom snooze uses the OS date picker, so this is web/desktop only.

   Suggested fix: derive the first weekday from Intl.Locale week info (weekInfo.firstDay / getWeekInfo()), then pass weekStartsOn (0–6) into Calendar. On desktop, use the host locale from desktopBridge.getSystemLocale() in apps/web/src/timestampFormat.ts — packaged Chromium reports en-US even when Windows is Monday-first. A settings override is optional; locale is enough for this issue.

   Related (same locale/week-start theme, not duplicates):

   • feat: add custom snooze dates and durations #11800 — added this calendar
   • fix(clients): respect locale for next-week snooze #9011 — locale-aware “Next week” preset; should share the same first-day helper so the menu and the grid agree
   • fix(web): style custom snooze time picker like the calendar #12440 — time-picker styling only

   Leaving this open as a low-severity UI bug. No further info needed.
4. maria-rcks

   closed this as completedin #12745on Sep 21, 2026