Set a time in the composer. It publishes at that minute, and still needs approval like any post.
The composer has a schedule switch. Set a date and time and the post publishes then.
Until it publishes
Only you can see it. It is not on your profile, not in anyone's feed, and it does not count towards the posting rule that keeps your subscriptions collecting — a post nobody can read has not been delivered to anyone.
It still needs approval
A scheduled post is reviewed like any other. If it reaches its time still unapproved, it publishes when it is approved.
Limits
Up to 90 days ahead, and up to 20 posts queued at once.
Your own screens
A scheduled post carries its go-live time wherever you see it, so it never looks identical to one that is already out.
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