Change your display language and time zone in Microsoft 365 for ...
At the top corner of your screen, select Settings > Microsoft 365 settings, and select the Settings tab. Select Language and time zone and choose the language you want. Then select Save. If you don't have a language setting option.
Applies To:
Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Small Business Admin, Office 365 operated by 21Vianet - Admin
Change the time zone and language settings in ...
You can change your language, date and time format, and time zone in Outlook.com or Outlook on the web settings. Go to Settings > General > Language and time or Region and time zone. Select the language, date format, time format, and time zone you want to use. Select Save.
Applies To:
Outlook on the web, Outlook.com
Changing your settings in Microsoft 365 for business or education
Sign in to Microsoft 365 with your work or school account. Click Settings to open the Settings pane and view your current settings. Choose a category in Settings, such as Theme, Start page, Password, or Language and time zone. Some Microsoft 365 settings, including display language, can't be changed by users in certain Microsoft 365 configurations.