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https://jira.codehaus.org/browse/MASSEMBLY-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=335145#comment-335145
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Steve Cohen commented on MASSEMBLY-670:
---------------------------------------

Looking at source some more I eventually find my way here:

org.codehaus.plexus.archiver.tar.TarArchiver line 318-320

318            long teLastModified = entry.getResource().getLastModified();
319            te.setModTime( teLastModified == 
PlexusIoResource.UNKNOWN_MODIFICATION_DATE ? System.currentTimeMillis()
320                            : teLastModified );

evidently, in my case, teLastModified == 
PlexusIoResource.UNKNOWN_MODIFICATION_DATE (0)

Why would that be the case?
                
> assembly plugin tar.gz format does not preserve timestamps of files it adds 
> to archive
> --------------------------------------------------------------------------------------
>
>                 Key: MASSEMBLY-670
>                 URL: https://jira.codehaus.org/browse/MASSEMBLY-670
>             Project: Maven Assembly Plugin
>          Issue Type: Bug
>          Components: component descriptor
>    Affects Versions: 2.4
>         Environment: linux
>            Reporter: Steve Cohen
>
> The .tar.gz archives created by the assembly plugin do not preserve the 
> timestamps of the files it adds to the archive.  There is no setting to 
> override this.
> This differs from the functionality of the tar program.  That program 
> preserves timestamps by default, when adding to the archive and there is no 
> option to change this, although there are options to change the timestamps on 
> extraction.
> The maven plugin should emulate tar here, I would think.

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