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Use %P instead of %p. That'll work with ruby 1.9 but for 1.8 you'll need to use .sub(' AM ', ' am ').sub(' PM ', ' pm ') or similar.
it seems that in ruby 1.9 you can use %P instead of %p and don't forget to remove a space
@comment.created_at.strftime("%I:%M%P %b %d") =>10:32am Dec 19