[Bug 1004368] Re: unzip shows the wrong date for zip files created on windows

[Launchpad Bug Tracker]

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

** Changed in: unzip (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1004368

Title:
  unzip shows the wrong date for zip files created on windows

Status in unzip package in Ubuntu:
  Expired

Bug description:
  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

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