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You could take a look at the sites you've been using.
Maybe they suggest a publishing date of
2011
jan 2011
01 2011
or
01 01 2011
in that case it is possible that a bug in calibre could by mistake present the date as 31-dec-2010
I myself do have the opposite problem.
Books set that fetch a pubdate of jan 2011 are displayed as 2 jan 2011 in stead of 1 jan 2011
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