Three date formats

[jrduncans]

In my CLI tool , after adopting dateparser, I was able to remove all but three custom formats.

Here are the sample date strings from the tests:

• 2020-12-17 00:00:34,247
• 03 Feb 2020 01:03:10,534
• 04:10:39 UTC 2020-02-17

I don't recall where I saw these that caused me to add tests and support for them, but if dateparser supported them I could pull out the remaining date-parsing code from timeturner and belt and other users of dateparser would support these date formats.