In Wagtail CMS, it is possible to schedule a page to be published at a time and date in the future.

On your editor page, there are 3 icons in the top corner of the screen.

Click the information (i) icon to reveal a side panel.

Click the Set schedule link to open a popup window with a time and date selector to set when the page should be published.

Set the date and time.

Save and click Set schedule.

The page is now scheduled to go live on the set time and date.

Click the arrow in the green button at the bottom to reveal the options.

Click publish.

The page is now scheduled to be published. The setting can be changed by editing the page.