In some cases, you may find that your browser is not displaying the date in the correct format in Caterbook (06/22/2019 instead of 22/06/2019).
In order to change this, you'll need to make some adjustments to your browser's default language settings.
First open the main menu and click on "Settings".
Scroll down to the bottom of the page and expand the "Advanced" menu.
And then expand the "Languages" menu.
You can then move the "English (United Kingdom)" language up to the top of the list and select "Display Google Chrome in this language", or add the language first if it's not present, using the "Add languages" button.
First open the main menu and click on "Options".
Then, in "General" settings, under "Language", click the "Choose" button.
On the following screen, you can move "English (United Kingdom) [en-gb]" to the top of the list using the "Move Up" button, or add the language first if not already present, using the "Select a language to add" dropdown, and clicking add.
On the default Start page, click the gear icon on the right of the page.
Then on the following page, select "United Kingdom (English)" from the dropdown list and click save.
In macOS, you will need to change the language in your System Preferences for this to be picked up by Safari.
From here, if you find English (U.K.) is not your Primary language you can add it if neccessary and then set as Primary.