An update from Facebook now enables Facebook Page admins to schedule posts to appear on their pages later. This means as a facebook page admin, you can now prepare a post and schedule it to appear later by adding a date and time in the future before you post it.
How To Get Started
From your Page's sharing tool:
- Choose the type of post you want to add to your Page
- Click the icon in the lower-left of the sharing tool
- Choose the future year, month, day, hour and minute when you'd like your post to appear
- Click Schedule
NOTE: You can schedule a post up to 6 months in advance in 15-minute intervals. If you choose a date in the past, the post will appear immediately at the appropriate place on your Page's timeline. All times correspond to the current time zone you're in.
How To View Your Facebook Page Scheduled Posts
From the admin panel, click on "Manage" ==> "Use Activity Log".
Source: Facebook Help