'Display Date' is an important attribute that lets your website visitors know the relevant date of a particular page. 'Display Date' does not necessarily have to be the date that the page was created or published (i.e. it is not the 'Publish Date').
Display Date is used as a key sorting feature in your widgets. Display Date can be used to display pages in chronological order. You will see the following sorting options within widget:
Display Date: Displays pages with the oldest display date at the top of the list. This is often used to sort 'Event' or 'Blog' pages, that have a display date set in the 'Pages Settings'.
Display Date Latest: Displays pages with the latest display date at the top of the list. This is often used to sort 'Event' or 'Blog' pages, that have a display date set in the 'Pages Settings'.