"X seconds/minutes/hours/months/years ago" dates

I wonder if it would be possible to get a pyblosxom flavour to display
the date of each story in the format:

"X [seconds|minutes|hours|days|months|years] ago"

instead of "posted at: 18:37." Would this require a new plugin?
Shouldn't be difficult to write, get the posted date of the story, get
the current date from the system, do some math.



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