UTC-fix + zoneinfo-fix

[tobixen]

This is a combination of merge request #334 and merge request #337.

If all tests pass, then it must be a temporarily glitch that merge request #334 didn't pass.

If there are the same test failures as in request #334, then ... probably that merge request breaks plone somehow.

Sorry for the flood of merge-requests. Don't know how to run those plone tests. I'm just interested in the icalendar library :-)

[mister-roboto]

@tobixen thanks for creating this Pull Request and help improve Plone!

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass.

Whenever you feel that the pull request is ready to be tested, either start all jenkins jobs pull requests by yourself, or simply add a comment in this pull request stating:

@jenkins-plone-org please run jobs

With this simple comment all the jobs will be started automatically.

Happy hacking!

[tobixen]

@jenkins-plone-org please run jobs

[tobixen]

@jenkins-plone-org please run jobs

[tobixen]

Uff - the failures now is due to the last bugfix, fixing a bug in the new test code.

[tobixen]

@jenkins-plone-org please run jobs

Trying to rerun tests ... as I still believe the test breakages are arbitrary and not related to my changes

[niccokunzmann]

@tobixen , we are in the process of setting up maintenance for this repository again, see #360. It will take some time but I hope, we will get further towards integrating your changes. Thanks a lot for the effort and patience already!
If you like to run the latest tests for this PR, you can rebase/merge master.

[coveralls]

Pull Request Test Coverage Report for Build 2898736507

• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 91.003%

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Totals
Change from base Build 2897629571:	0.1%
Covered Lines:	1143
Relevant Lines:	1256

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💛 - Coveralls

[niccokunzmann]

Thanks @tobixen! That is a nice PR with a lot of tests!