introduce DAYS_SINCE_PROJECT_START

[dss539]

credit to @felegy for the changes

[jenkinsadmin]

Thank you for a pull request! Please check this document for how the Jenkins project handles pull requests

[DenizThatMenace]

Hello Derrick,
sorry for the late response. I somehow missed the github-notification and your e-mail as-well.

Your changes seem to work and are a useful extension to the plugin.
However, in order to not being overlooked, the new feature should have some kind of documentation/help. At least it should be mentioned in the help that gets displayed when clicking the little ?-icon next to the appropriate option. Some tests are always good, too.

So, before accepting your pull-request, I recommend you add the appropriate documentation and a small test-case. The files you need to edit for this are already existent and you should easily determine how to add the documentation and test.

Additionally, I would like you to squash all your changes into a single commit.
For information about how to do this you can look here.

Thanks,
Deniz

[dss539]

Hi Deniz,

I'll try to address your concerns after I set up an java dev environment.
Thanks for responding, I'll put this on my TODO list.

Best Regards,
Derrick