Facebook team always busy for new updates that may result pages owner to face some issues for the time being. Also you face some issue that make you surprise similar like the schedule post.
Schedule post allows users to publisher their post later on selected time, that you can set the minimum of upcoming 10 minutes. To view all schedule post lists goto Publishing Tool > Schedule Post under Post on left side. You can delete multiple post by checking checkbox. 25 post are displayed at a single page, to view next click on the right
Facebook also allows Page owners to post a “Back Date” and Save Draft.
Backdate publish a post on later date, that shows a mentioned previous date. This usually work when you missed a post on a particular date so you can go with Backdate and publish a post with a any old date.
Note: Backdate feature only publish post with old date.
Upload a post, set title, description and other detail but save to later publish. This option always save time and effort when times fly to launch your brand posts or any other post. It is easy to publish or schedule saved draft posts, find the save draft items by going > Publishing Tool (page menu) > Draft.