in reply to Archive::Zip Modify Date Oddity

The Zip (file format) uses FAT timestamps which only have a resolution of two seconds.

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Re^2: Archive::Zip Modify Date Oddity
by lhchin (Novice) on Jan 04, 2017 at 00:29 UTC
    Thank you for sharing the info. If this is to mimic windows time stamp, it is not desirable. Further test verified it does round down the original file Modify date to lower even-seconds.
    It is not the case when tested using Windows GUI or Unix Shell from Perl to zip file, it does not modify the original Modify date of the file.
    As such I have submitted an enhancement request to the Archive::Zip Library in cspan.org for ZIP64 support for higher-resolution NTFS or Unix file timestamps
[reply]

      Zip64 support doesn't have anything to do with the granularity of the timestamp recorded in the zip file. It just allows file larger than 4Gig to be stored in a zip archive.

      The two second time granularity is dealt with in modern zip implementations by storing an extended timestamp field.

      Archive::Zip::SimpleZip supports this field.

[reply]
        Thank you for the info. SimpleZip is not install as basic Perl Library.
        Alternatively running the shell Zip command within Perl handles the Modify date correctly, which is a simpler solution.
[reply]

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