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https://issues.apache.org/jira/browse/MJAR-300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816451#comment-17816451
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Henning Schmiedehausen commented on MJAR-300:
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In your second example:
2024-02-11T10:46:07+01:00
0 Sun Feb 11 09:46:06 CET 2024 META-INF/
There is a one hour difference between those two values (10:46:xx +01:00 is
*NOT* 09:46:xx CET)
In your third example:
2024-02-11T09:46:43+00:00
0 Sun Feb 11 09:46:42 CET 2024 META-INF/
There is a timezone shift here (+00:00 is *NOT* CET)
your fourth example I could not reproduce:
DATE=$(TZ=America/New_York date -Iseconds) ; echo $DATE ; TZ=America/New_York
mvn -q -Dproject.build.outputTimestamp=$DATE clean package ; jar tvf
target/jartest-0.1-SNAPSHOT.jar
2024-02-11T15:18:32-05:00
0 Sun Feb 11 20:18:32 PST 2024 META-INF/
699 Sun Feb 11 20:18:32 PST 2024 META-INF/MANIFEST.MF
0 Sun Feb 11 20:18:32 PST 2024 META-INF/maven/
0 Sun Feb 11 20:18:32 PST 2024 META-INF/maven/jartest/
0 Sun Feb 11 20:18:32 PST 2024 META-INF/maven/jartest/jartest/
5 Sun Feb 11 20:18:32 PST 2024 testfile.txt
575 Sun Feb 11 20:18:32 PST 2024 META-INF/maven/jartest/jartest/pom.xml
56 Sun Feb 11 20:18:32 PST 2024
META-INF/maven/jartest/jartest/pom.properties
This still produces an archive with timestamps in my local timezone and
15:18-05:00 would be 12:18-08:00 (PST), we are three hours behind. So the
results make even less sense (why would a timestamp of 15:18-05:00 end up being
20:18-08:00?)
You literally reproduced the problem in your second and third example with the
evidence visible.
> maven jar plugin does not interpret build outputTimestamp correctly
> -------------------------------------------------------------------
>
> Key: MJAR-300
> URL: https://issues.apache.org/jira/browse/MJAR-300
> Project: Maven JAR Plugin
> Issue Type: Bug
> Affects Versions: 3.3.0
> Reporter: Henning Schmiedehausen
> Priority: Major
>
> consider a minimal project that packages a jar:
> % DATE=$(date -Iseconds) ; echo $DATE ; mvn -q clean package ; jar tvf
> target/jartest-0.1-SNAPSHOT.jar
> 2024-02-10T21:44:53-08:00
> 0 Sat Feb 10 21:44:54 PST 2024 META-INF/
> 568 Sat Feb 10 21:44:54 PST 2024 META-INF/MANIFEST.MF
> 0 Sat Feb 10 21:44:54 PST 2024 META-INF/maven/
> 0 Sat Feb 10 21:44:54 PST 2024 META-INF/maven/jartest/
> 0 Sat Feb 10 21:44:54 PST 2024 META-INF/maven/jartest/jartest/
> 5 Sat Feb 10 21:44:54 PST 2024 testfile.txt
> 575 Sat Feb 10 21:39:50 PST 2024 META-INF/maven/jartest/jartest/pom.xml
> 56 Sat Feb 10 21:44:54 PST 2024
> META-INF/maven/jartest/jartest/pom.properties
> Note how the timestamp returned by the date command and the timestamps of the
> entries in the jar are basically the same (around 21:44:53 - 21:44:54 on Feb
> 10th, 2024)
> Now use that date as the project build timestamp:
> DATE=$(date -Iseconds) ; echo $DATE ; mvn -q
> -Dproject.build.outputTimestamp=$DATE clean package ; jar tvf
> target/jartest-0.1-SNAPSHOT.jar
> 2024-02-10T21:46:30-08:00
> 0 Sun Feb 11 05:46:30 PST 2024 META-INF/
> 568 Sun Feb 11 05:46:30 PST 2024 META-INF/MANIFEST.MF
> 0 Sun Feb 11 05:46:30 PST 2024 META-INF/maven/
> 0 Sun Feb 11 05:46:30 PST 2024 META-INF/maven/jartest/
> 0 Sun Feb 11 05:46:30 PST 2024 META-INF/maven/jartest/jartest/
> 5 Sun Feb 11 05:46:30 PST 2024 testfile.txt
> 575 Sun Feb 11 05:46:30 PST 2024 META-INF/maven/jartest/jartest/pom.xml
> 56 Sun Feb 11 05:46:30 PST 2024
> META-INF/maven/jartest/jartest/pom.properties
>
> The timestamp and the entries in the jar differ by eight hours (the offset of
> my local timezone).
> When forcing UTC:
> DATE=$(TZ=UTC date -Iseconds) ; echo $DATE ; mvn -q
> -Dproject.build.outputTimestamp=$DATE clean package ; jar tvf
> target/jartest-0.1-SNAPSHOT.jar
> 2024-02-11T05:48:22+00:00
> 0 Sun Feb 11 05:48:22 PST 2024 META-INF/
> 568 Sun Feb 11 05:48:22 PST 2024 META-INF/MANIFEST.MF
> 0 Sun Feb 11 05:48:22 PST 2024 META-INF/maven/
> 0 Sun Feb 11 05:48:22 PST 2024 META-INF/maven/jartest/
> 0 Sun Feb 11 05:48:22 PST 2024 META-INF/maven/jartest/jartest/
> 5 Sun Feb 11 05:48:22 PST 2024 testfile.txt
> 575 Sun Feb 11 05:48:22 PST 2024 META-INF/maven/jartest/jartest/pom.xml
> 56 Sun Feb 11 05:48:22 PST 2024
> META-INF/maven/jartest/jartest/pom.properties
> The timestamp is "correct" but I passed it in as UTC but the jar plugin
> considers it "local time" and silently attaches PST as timezone. This is
> where the eight hours discrepancy come from.
> This seems to be specific to the outputTimestamp parsing of the jar plugin.
>
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