Solved it!
For anyone who wants to know:
Changed the input type for <label for=”tour_date_info_date”> to ‘date’ instead of ‘text’ in plugin file post-type-tour-date.php
Added “$new_format_date = date(“jS M y”, strtotime($tour_date));” to loop-tour-home.php
(this is where you change the date format to whatever you want it to be, look up php date formats for a full list)
and then changed $tour_date to %new_format_date where I wanted it to display.