SoIf you're wondering why I didn't post yesterday--well, I thought I did. When I write a draft of a post, I add a day to the posting date so that it doesn't go live accidentally.
I did that yesterday, but completely forgot to change the date back. So I finished the post, hit "publish", and went about my business. It didn't post, though, because I didn't change the date.
Yes, I'm as surprised as you are that this hasn't happened before.