Directory modified times aren't preserved when extracting
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#1213 Directory modified times aren't preserved when extracting
When extracting a zip file (by right-clicking on the zip file in Windows Explorer and choosing Extract Here; other methods are untested), the "last modified" timestamps on any extracted directories are not preserved.
I suspect that what's happening is that the last modified timestamps are set but are then immediately reset to the current time as files are extracted to those directories.
I reported this bug once to winrar.. you have to set folder modification/creation timestamps recursively after all files are written in the directories .. otherwise they get updated to current time (i'm not sure if there actually is a problem in current 7z, though)