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Settings > General > Language & region gets "Week starts on" (Monday, Sunday or Saturday), and Admin > User Defaults a default for everyone who has not picked one. Monday stays the built-in value, so nothing changes for anyone who leaves it alone. Both calendar implementations follow it: CustomDatePicker, used by trip dates, bookings, costs, to-dos and the admin school holidays on desktop and phone, and the journey date picker, whose weekday headers were hardcoded English and now speak the app language. The grid math and the header row live in one helper (utils/calendarWeek.ts). The day names on the options come from Intl, so only the label and a hint needed translating. Vacay keeps its own per-plan week start. The value is validated like the other regional settings: VALID_VALUES for admin defaults, the display-settings MCP tool, and the managed key list. Addresses discussion #2029.