You can configure Facebook to schedule a post to be shared between 30 minutes and one month from when you create the post. For those of us that want to know, Facebook allows its users to send automated posts from their company’s Facebook page by setting a date and time at which they would want the post to appear. See: Schedule Facebook Posts on Personal Page
5. Click Schedule.
See: How do I Send Automated Posts on Facebook?
You can also edit, reschedule or delete already scheduled Facebook group posts. To do that, do the following;
1. You’ll need to click “see posts” that is next to at the top of the group
2. Click next to the post you want to make changes to
3. Finally, click Edit Post, Delete Post, Reschedule Post or Post Now
Bear in mind that to see a history of all edits to a scheduled Facebook post, you’ll need to click View Edit History. See: How to Clear Facebook Chat on iPhone
Schedule Facebook Group Posts