Change the language of the Calendar (names of the days and months)

The names of the days and months as displayed in your Calendar is coming from your configured Region and Language formatting settings in the Settings or Control Panel section of Windows and not from Outlook.

In Windows 10 and Windows 11, there are various “English (country)” formats to keeps the display language for the days and months in English but use the regional format of the country.

Unfortunately, this doesn’t apply to all countries and Windows 8 and Windows 7 don’t have these listings at all so you will end up in a mixed language environment.

For those cases, the solution (or actually workaround) is to still select an English format template but then adjust the rest of the formatting template to match your own language style again.

Note: If the name of the Calendar folder itself is in a different language than Outlook’s language see: Modify the language of the default mailbox folders.

Set Format style to English

You can change the language format in the following location;

• Windows 11
• Settings-> Time & Language-> Language & region-> section: Region-> dropdown list: Regional Format
• Control Panel-> Clock and Region-> Region
• Windows 10
• Settings-> Time & Language-> Region-> dropdown list: Regional Format
• Control Panel-> Clock and Region-> Region
• Windows 8
  Control Panel-> Clock, Language, and Region-> Region
• Windows 7
  Control Panel-> Clock, Language, and Region-> Regional and Language

The names of the days and months depend on the language format set in the Regional and Language applet in Control Panel.

Customize formatting settings for your language

After you’ve changed the language format template, review the settings for it. Especially for European countries, these can be quite different from the English (United States) style.

For instance;

• Date format; day before month
• Date format; - or . as separators
• Time: 24 hour display
• First day of the week: Monday
• Decimal symbol: ,
• Digit grouping symbol: .
• Measurement system: Metric
• Currency symbol: €

Note: Often the list separator is also a semicolon ( ; ) instead of a comma ( , ) but I prefer to set it to a comma as it solves a bug with importing/exporting csv-files (comma separated values).

Some of these values cannot be changed directly to the correct format from the Format tab such as the date format. To change this, click on the Additional Settings… button and select the Date tab. Here you can freely type the format that you want.

English (US) format template customized to the Dutch format produces English names of days and month in the Outlook Calendar while maintaining the Dutch notation standards.