If you go to the py7zlib page you will see a comment describing a problem with the timestamps. I was having a similar problem with the timestamps, except the comment didn't provide a patch or a way to convert time time. This problem exists in svn trunk as of this writing, although it was discovered a year ago. The issue is perhaps due to a slight fileformat shift, but essentially there is an extra byte (or 9) that are not being read and shifting the time results.
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