ccma fix date parsing

[celebdor]

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• [x] Bug fix
• [ ] Improvement
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Description of your pull request and other information

This PR fixes the date to the way ccma provides it as well as fixing some broken tests

closes #30961

[dirkf]

The download tests are failing. Please check if this is happening locally. Both in Py 2.7 and Py 3.9 there's 403 on extraction in one test, and failing to get the timestamp/upload_date in others. Possibly the webpage is somehow not being decoded into UTF-8.