I go into the Call Log. It's 3AM. Call comes in 5 hours ago and it says "5 Hours ago" instead of Yesterday. Then it proceeds to confuse Yesterday with the day before as a result. Anything within 24 hours is "today." Using a Motorola Droid.
I guess you can delete this. Took me a while to find other references but I see this absurd mistake still hasn't been correctly for 4 months. Very sad.