R. David Murray added the comment: The problem is that if it returns None on parse failure, then you can't tell the difference between the header not existing and the date not being parseable. I don't have a solution for this problem. Suggestions welcome. (Note that this is only a problem in the new policy, where the parsing is done automatically; in the compat32 policy you have to apply parsedate yourself, so you can tell the difference between a non-existent header and a failed date parse).
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