All Charts at myBodyGraph use a default date format: DD/MM/YYYY or Day / Month / Year.
If you would like to change the date format to MM/DD/YYYY, you can do so in your settings:
Click on the BodyGraph icon next to your name on the right of the menu bar,
Head to 'Settings',
Select the 'Options' subtab,
Under 'Date Input Format' select the desired date format from the drop-down menu,
Click 'Save Changes'.