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How to Fix Wrong Regional Date Format in Excel for Mac
Question details
The user needs to resolve an issue where Excel for Mac displays dates using an incorrect regional format instead of the expected local format.
- Product
- Microsoft Excel for Mac
- Device & OS
- macOS
- Scenario
- Formatting dates in an Excel workbook on a Mac device.
- Observed behavior
- Excel displays dates according to the macOS default system format (such as US formatting) rather than the user's expected regional format, a behavior sometimes triggered by recent system or application updates.
Before altering your system language or application settings, verify your current macOS version and ensure your Excel workbook is saved to prevent any accidental data loss.
Adjust macOS Language and Region Settings
Since Excel relies on macOS system settings for default date formats, correcting your Mac's primary language and region will often restore your expected date formatting.
Excel for Mac integrates closely with macOS system preferences. If your primary OS language is set to English (US), Excel will default to the MM/DD/YYYY format. Changing this to a localized variant like English (UK) can resolve the issue.
Click the Apple menu in the top-left corner of your Mac screen and select 'System Settings' (or 'System Preferences' on older macOS versions).
Click on 'General' in the sidebar, and then select 'Language & Region' from the available options.
Under 'Preferred Languages', click the '+' button to add 'English (UK)' or your specific local language, and drag it to the top of the list to make it the primary language.
Close Microsoft Excel entirely and reopen it to allow the application to sync with the new system date format settings.
Apply Fixed Date Formats in Excel
Use this method if you want to force a specific date format in your workbook that will not change regardless of the operating system's regional settings.
Try WPS Office for a Seamless Mac Spreadsheet Experience
If OS updates continue to disrupt your date formats in Microsoft Excel, consider switching to WPS Office. It provides a highly compatible, stable alternative with robust cell formatting tools that work perfectly on macOS without unexpected system conflicts.
- 1. Download WPS Office: Visit the official WPS website and download the free WPS Office installation package for macOS.
- 2. Open Your Spreadsheet: Launch WPS Spreadsheets and open your existing Excel workbook. Your data and layout will be preserved.
- 3. Format Cells Seamlessly: Use the Format Cells dialog in WPS to quickly apply permanent regional date formats that stay consistent.
Frequently Asked Questions
Why did my date formats change suddenly in Excel for Mac?
This usually happens after an update to macOS or Microsoft Excel. Excel date formats that are marked with an asterisk (*) automatically sync with your macOS regional settings. An OS update that accidentally resets your default region can immediately alter how dates appear in your spreadsheets.
How can I stop Excel dates from changing when sharing the file with others?
To prevent dates from changing when opened on different computers, avoid using the default system formats. Instead, select your dates, open the 'Format Cells' dialog, choose a specific Locale (like English U.K.), and pick a date format that does not have an asterisk (*) next to it.
Can changing the Mac language from English (US) to English (UK) fix date issues?
Yes. The English (US) setting defaults to the MM/DD/YYYY format. By changing your macOS primary language or region to English (UK) or another European setting, the system changes its default to DD/MM/YYYY, which Excel will automatically adopt after a restart.
