We’ve just deployed the ability to schedule posts. You’ll see a new “Post later” option on the compose screen. If you click it, you’ll get an option to choose the time and date when your message should be delivered.
This feature is brand new, this is the first draft, and it’s still in alpha. It’s best to only schedule posts for a month or so in advance. Further into the future should work, but a month is the safest window. Posts should be delivered within a minute of your specified time, but they could take up to 5 minutes under some circumstances.
We’ll work on making the interface prettier and easier to use, adding a calendar to choose the date, and so on. For now, it should get the job done. If you experience any issues or have any feedback at all, please let us know in the comments.