Office Settings & Configuration

How to Change Date and Regional Settings in Excel for the Web

Amos GikundaAmos Gikunda Nov 10, 2026 869 views

Question details

The user needs to change the regional date format in Excel for the Web so that dates entered in a specific format (such as German) are accepted by data validation rules.

How to Change Date and Regional Settings in Excel for the Web
Product
Excel for the Web
Device & OS
not provided
Scenario
Entering dates in non-US formats into an Excel spreadsheet online and encountering data validation errors.
Observed behavior
Excel for the Web rejects non-US date entries because the regional settings default to US-style dates.
Before you start

Ensure you are logged into your Microsoft 365 account and have the Excel workbook open in your web browser. Note that changes to personal settings apply only to your view, while organization-wide changes require administrator access.

Solution 1Recommended

Change Personal Regional Format Settings in Excel for the Web

Update your individual regional format settings directly within Excel for the Web to accept your preferred date formats.

This method allows you to change the locale for your own account, enabling Excel to recognize date formats specific to your region, such as German dates, without affecting other users.

1
Open Options

Click on 'File' in the top-left corner of the ribbon menu, then select 'Options' from the sidebar.

2
Access Regional Settings

Click on 'Regional Format Settings' (or 'Change regional format settings') from the available menu options.

3
Select Desired Region

Choose your appropriate regional format, such as German, from the dropdown list to apply the correct date and number formats.

Change Personal Regional Format Settings in Excel for the Web
Scope of Change: This modification updates your personal settings immediately, allowing data validation rules to accept your local date formats.
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Frequently Asked Questions

Why does Excel for the Web reject my non-US date formats?

By default, many Microsoft 365 environments apply US regional settings. If a data validation rule expects a US date (MM/DD/YYYY) and you enter a European date (DD.MM.YY), Excel will reject it as invalid data.

Will changing my regional settings in Excel for the Web affect other users?

No, changing the format via File > Options > Regional Format Settings only updates your personal view and data entry preferences. Other users viewing the same shared document will still see the dates in their own preferred formats.

How can I change the default date format for a shared Excel online workbook?

To change the default regional settings for everyone using a shared workbook, a Microsoft 365 administrator must update the regional settings of the hosting SharePoint site or OneDrive organization tenant.