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Language and timezone selects with a live date and number format preview row and a first-day-of-week toggle.
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Language Region Settings is the localization panel, a Language Select defaulting to English (UK) and a Timezone Select defaulting to London (UTC+0) with the auto-detected note Change if you travel, then two preview rows where the date format shows 13/06/2026 live and the number format describes its own convention (Period decimal, comma thousands), and finally a first-day-of-week toggle between Monday and Sunday that affects calendar and scheduling views.
Languages, timezones, date formats, and number formats are each a flat array; the preview row reads from the active selection with a guarded find so a missing entry never crashes. The live preview line is the feature that prevents the wrong format from shipping silently.
Reach for this block on the personal preferences page of a settings shell, wired to your locale storage and applied at the session level so teammates keep their own preference. Re-render date strings across the app when the selection changes.
A natural flow around it on an Application Pro page:
Before
After
One strong use is the personal locale panel. Other variants:
Tip: show the preview line even when the format is already correct, confirmation that nothing changed is more reassuring than silence.