MSHARED-1430 [MJAR-314] Use the special constant value REPRODUCIBLE_BUILD_STATIC_DATE

[stokito]

The Gradle has an option preserveFileTimestamps = false that will just put 1 Feb 1980 as a date in Zip archive.
The 1 Jan 1980 is a minimal date in Zip archive but the 1 Jan has some special treatment by Java.
That's why the Gradle team used the 1 Feb.
Introduce a constant value for the outputTimestamp to make an intention clear but also easier to find an explanation for this.

https://issues.apache.org/jira/browse/MJAR-314 / https://issues.apache.org/jira/browse/MSHARED-1430

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[slawekjaranowski]

We should have a separate issue for each component.
When we do release we need an issue to prepare a release notes for each component separately.

[stokito]

I created the https://issues.apache.org/jira/browse/MSHARED-1430
and https://issues.apache.org/jira/browse/MCOMPILER-600.
But before I mistakenly created a duplicated issue in the maven-jar-pugin https://issues.apache.org/jira/browse/MJAR-314
Please close it

[hboutemy]

-1 no
already done in https://issues.apache.org/jira/browse/MNG-8258 in a way that is configurable by project
doing that in this component does not make sense

[stokito]

Oh I see, so this will be enabled not just for the Maven itself but by default for all projects that use the Maven (including the Maven itself).
Then yes, the PR is not needed. The only thing worth to be changed is the default static time. It would be better to use same date as Gradle use 1 Feb 1980. This was already discussed and while the Maven 4 is in beta it's good time to change it. I'll try the Maven 4 later, maybe I don't need to change anything in a project to get reproducible build.