The date format displayed at the bottom of your group name can be modified to your liking, as different regions have different date format preferences.
This can be modified through your settings.
Step 1: Go to Settings by clicking on your avatar on the upper right corner
Step 2: Go to Display tab
Step 3: Select desired format on Date Format drop-down, then click Save Changes
We hope you find this helpful! If you need any further assistance, please contact us and we'll be more than glad to help you out.