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Hello @tannovanwaarde,
if you deactivate the Multi-Step Checkout plugin for a moment, does the date format change to the european standard?
We are not the developers of the Checkout Field Editor for WooCommerce plugin, but normally the date format should be the same as in the “Date Format” option on the “WP Admin -> Settings -> General” page.
If your date format on the checkout field doesn’t follow the same date format as on the “WP Admin -> Settings -> General” page, then you might want to contact the support team of the Checkout Field Editor for WooCommerce plugin and ask them for help.