The calendar date formats changes across the calendars (Vendor, Listing calendars and the Dashboard). I’ve checked and the WP date settings are set to d/m/Y but that doesn’t seem to get carried over to the HP calendars. Another issue is the American format of month-day-year and some of us, very few I suspect, live outside of America and thus use British format of day-month-year.
Is there an easy way to standardise the date display across the calendars and to change the format to British?
Please disable third-party plugins and customizations (if there are any) and check if this issue persists. If you use a caching plugin, make sure that caching is disabled for logged-in users.