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https://issues.apache.org/jira/browse/MJAR-300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816452#comment-17816452
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Henning Schmiedehausen commented on MJAR-300:
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the fourth example just reinforces what I wrote:
15:18 -05:00 == 20:18 UTC (b/c America/New_York is five hours behind UTC) and
the timestamp in the archive is shown with PST, so it turns into "20:18 PST".
> 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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