Quick fix: Each Windows user account has its own regional format. Open Settings → Time & language → Language & region → Regional format. Pick a different locale than the one used by other users on the same PC. Date, currency, and number formats apply per-user without affecting Country/region setting.
You share a PC with someone who works with US clients while you work with European clients. They need MM/DD/YYYY and USD currency; you need DD/MM/YYYY and EUR. Windows 11 supports per-user regional format independently. The setting follows the user, not the device.
Affects: Windows 11 (and Windows 10) with multiple user accounts.
Fix time: ~5 minutes per user.
What causes this
Windows separates Country or region (a system-level setting visible to Windows Update and Store) from Regional format (a per-user preference for how dates, currency, numbers display). Regional format is purely a display setting — it doesn’t affect what region the PC reports to Microsoft.
Each user account has independent Regional format. Apps read the active user’s setting via system APIs and adjust display.
Method 1: Set Regional format in current user’s Settings
The standard route.
- Sign in as the user you want to configure.
- Open Settings → Time & language → Language & region.
- Find Regional format. Click the dropdown.
- Pick a locale: English (United Kingdom) for DD/MM/YYYY and £ currency; French (France) for DD/MM/YYYY and €; Japanese (Japan) for YYYY/MM/DD and ¥; etc.
- Below the dropdown, expand to confirm the format previews: date format, time format, currency symbol, number format.
- For mixed conventions (e.g., English language, German date format): click Change formats button (below the dropdown). Tweak individual components: Short date, Long date, Short time, Long time, First day of week.
- Click Apply or just close Settings.
- Open an app that shows dates (File Explorer, Word, Excel). New format applies immediately.
This is per-user. Other accounts on the PC are unaffected.
Method 2: Configure detailed format components
For mixing display preferences (e.g., 24-hour time but US date format).
- Open Control Panel → Region. (Not Settings — Control Panel has more detailed options.)
- Switch to Formats tab.
- Set Format to the closest locale to your preference.
- Click Additional settings button. Five tabs of detailed options:
- Numbers: decimal symbol, digit grouping (e.g., 1,000 vs. 1.000), negative sign, leading zeros.
- Currency: symbol, positive/negative format, decimal symbol, digit grouping.
- Time: 12-hour vs. 24-hour, AM/PM symbols, time separator.
- Date: short date format (MM/DD/YYYY or DD/MM/YYYY etc.), long date format, week of year first day.
- Sorting: alphabetical sort method.
- Configure each component as needed. Click Apply → OK.
- For example: language English, time 24-hour, date DD/MM/YYYY, currency EUR — mix and match.
This is the right path for granular control beyond preset locales.
Method 3: Apply Regional format to all new user accounts
For setting up a default for everyone on the PC.
- Open Control Panel → Region.
- Switch to Administrative tab.
- Click Copy settings button.
- The Welcome screen and new user accounts dialog opens.
- Tick both Welcome screen and system accounts and New user accounts.
- Click OK.
- Windows copies your current Regional format settings to the system defaults and to any newly-created accounts.
- For existing accounts: each user must configure their own Regional format. Method 3 only affects new accounts going forward.
- For corporate deployment: configure regional format in the user profile template, then deploy with sysprep.
This is the right approach for new PC setup.
How to verify the fix worked
- Open File Explorer. Right-click a file → Properties → Details. Date Created and Modified use your configured format.
- Open Excel. Type a date. Excel formats per your regional setting.
- Sign out, sign in as a different user. Their Regional format should differ from yours, confirming per-user independence.
If none of these work
If Regional format changes don’t apply or revert, the cause is usually one of: Group Policy on managed PCs: Computer Configuration → Administrative Templates → System → Locale Services may enforce specific regional format. Run gpresult /h C:\gpresult.html → search for Locale to verify. For apps that don’t respect Regional format: some apps have their own internal date/currency settings (Excel formats, browser settings). Configure within those apps separately. For mixed regional preferences that conflict: e.g., you set 24-hour time but Word still shows AM/PM. Word reads from a Microsoft Office regional template, not Windows directly. Adjust in Word → File → Options → Advanced → Default for date format. For language vs. format mismatches: if you set display language English but Regional format Japanese, Windows handles consistently but some third-party apps may use display language as proxy for region — expect occasional inconsistencies.
Bottom line: Each user’s Regional format is independent. Settings → Language & region → Regional format — pick a locale or use Control Panel for granular component-level control.