Well, I've noticed it again, and, though I realise there might be a fix, I thought I'd give a more detailed bug report:
It's 11:00 pm. at this time and after, anything posted is called yesterday. Actually gives me a feeling of time travel.
anything before that time is correctly called "today" and the right time- 10:48 say. However, after 11 it gets relegated to 'yesterday'
humming beatles song..
EDIT: GMT -5 or -4 (Can't remember)