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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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.
How do you know it just doesn't hide the year if it is in the same year as the question anyway?
I would say:
And full dates beyond that.