In your Groups.io account, you can set display preferences that apply to all of the groups you belong to at that email address:
Set the language in which Groups.io user interface elements and notifications will be displayed. From the list, select the language you want to use.
Note: If you notice any translation errors, or if you are interested in contributing to Groups.io’s internationalization efforts, see Language Support.
Set the timezone used for displaying times on group websites. From the list, select the timezone you want to use.
Display times on group websites using a 12-hour clock or a 24-hour clock. From the list, select the hour format you want to use.
Set the display of numeric dates on group websites. From the list, select the date format you want to use.
Select this checkbox if you want the week in group calendars to start on Monday instead of Sunday.
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