Originally Posted by kovidgoyal
The python Zip library does not preserve timestamps when extracting from zip files. While I could patch it, I dont care enough to do so. If you do, the code is in calibre.utils.zipfile.
EDIT: If you do decide to add that functionality, remember that zip files dont store time zone into on their timestamps. So you essentially have no way of knowing what time the timestamp in a zip file actually is
Thx for confirming the above Kovid. Since other zip programs manage to work around the timezone issue presumably there must be some sort of compromise?