Sorry, but the birthday cake display is off by my timezone difference.
The cakes showed up yesterday afternoon when the birthday was today, and after clearing my cache just now, they're gone - in the middle of the birthday date.
On a side note, what if a thread hasn't been posted to for a while? Do the last birthday cakes stay there until either a reply is posted or someone else in that thread has a birthday and the page is viewed? Why didn't the fact that the calendar thought the birthday was over trigger a cache overwrite for that page?
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