If you have an extension account

  1. Make sure that the Scheduled Posts page remains open while scheduling is being done. Yes, it’s mandatory to keep it open otherwise the scheduling doesn’t happen.
  2. Please make sure the timezone is correct, please check it in the setting section.
  3. Make sure your PC or Mac does not go to sleep or turn off at the scheduled time of the post

If for some reason, your PC is shutdown or goes to sleep at the scheduled time of post, you can always post it from the Scheduled Post Log.

If you have premium account, you can simply set and forget. Your post will be made on time :D