Seeing as how SO's one year anniversary is coming soon, question and answer dates are going to need to display the year.
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How do you know it just doesn't hide the year if it is in the same year as the question anyway?
If you hover the tool tip does show the year.
Currently in the non-tool tip display it displays:
I believe it would be good to show: DD/MM/YYYY (or some variant thereof) after the question is a year old.
I would say:
And full dates beyond that.