Why are all-day calendar events not appearing in the Notification Center?

I've noticed that all-day Calendar events do not appear in the Notfication Center in iOS. This is a glaring omission and I'm not sure if it's related to a bug or is intentional but it should be fixed right away. Why in the world would you leave out an all-day event from the Notification Center? What if I had a wedding anniversary or some other important event to remember?