unzip shows the wrong date for zip files created on windows

[Ferry Toth]

I have a zip file created by winzip. Later using winzip files were replaced.

Both windows built-in zip viewer and winzip show the replaced files dates of the newly replaced file.

On ubuntu precise the old date (of the original files) are shown.

Using zipinfo -v I have listed the info in the zip file (only the info of 1 file shown here for clarity), see below.
It appears that there are 3 file modification dates stored, of which windows uses the DOS Date/Time (as they would) and unzip uses the UT extra field time.

However, on replacing the file winzip appearently has chosen to update only tyhe DOS Date/Time field.

This may be a bug of winzip, it is however causing problems for Ubuntu users.

The expected behavior would be:
- if the file is created on DOS/Windows ( file system or operating system of origin: MS-DOS, OS/2 or NT FAT)
- use file last modified on (DOS date/time).

Ferry

output of zipinfo:
++++++++++++++

zipinfo -v GRB-120411
Archive: GRB-120411.zip
There is no zipfile comment.

End-of-central-directory record:
-------------------------------

  Zip archive file size: 24810 (00000000000060EAh)
  Actual end-cent-dir record offset: 24788 (00000000000060D4h)
  Expected end-cent-dir record offset: 24788 (00000000000060D4h)
  (based on the length of the central directory and its expected offset)

  This zipfile constitutes the sole disk of a single-part archive; its
  central directory contains 5 entries.
  The central directory is 416 (00000000000001A0h) bytes long,
  and its (expected) offset in bytes from the beginning of the zipfile
  is 24372 (0000000000005F34h).

Central directory entry #1:
---------------------------

  120411-1-2-np.drl

  offset of local header from start of archive: 0
                                                  (0000000000000000h) bytes
  file system or operating system of origin: MS-DOS, OS/2 or NT FAT
  version of encoding software: 2.0
  minimum file system compatibility required: MS-DOS, OS/2 or NT FAT
  minimum software version required to extract: 2.0
  compression method: deflated
  compression sub-type (deflation): normal
  file security status: not encrypted
  extended local header: no
  file last modified on (DOS date/time): 2012 May 7 15:29:06
  file last modified on (UT extra field modtime): 2012 Apr 23 13:45:44 local
  file last modified on (UT extra field modtime): 2012 Apr 23 11:45:44 UTC
  32-bit CRC value (hex): 672661c0
  compressed size: 262 bytes
  uncompressed size: 518 bytes
  length of filename: 17 characters
  length of extra field: 24 bytes
  length of file comment: 0 characters
  disk number on which file begins: disk 1
  apparent file type: text
  non-MSDOS external file attributes: 81B600 hex
  MS-DOS file attributes (20 hex): arc

  The central-directory extra field contains:
  - A subfield with ID 0x5455 (universal time) and 5 data bytes.
    The local extra field has UTC/GMT modification/access times.
  - A subfield with ID 0x7875 (Unix UID/GID (any size)) and 11 data bytes:
    01 04 e9 03 00 00 04 e9 03 00 00.

  There is no file comment.
++++++
lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
++++++++++++++++++
apt-cache policy unzip
unzip:
  Geïnstalleerd: 6.0-4ubuntu1
  Kandidaat: 6.0-4ubuntu1
  Versietabel:
 *** 6.0-4ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status

[Dominik Viererbe (dviererbe)]

Thank you for reporting this bug to Ubuntu.

Ubuntu 12.04 (precise) reached end-of-life on April 28, 2017.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.

[Launchpad Janitor (janitor)]

[Expired for unzip (Ubuntu) because there has been no activity for 60 days.]