Future posts disappear

I’ve always been able to write a post and have it appear tomorrow (or whenever). Since upgrading to 2.6 when I try to advance post the post simply disappears. It’s not in the list of published posts, it’s not in drafts and it’s not in private. It just is not THERE!

What am I doing wrong? On the old version, there was a check box to verify that you wanted to change the time stamp, but I don’t see it in 2.6