BUG: Cannot create third-party ExtensionArrays for datetime types (xfail)
- [x] closes #34986
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

This is just the failing test for now, happy to implement a fix if someone could tell me the location where this should be fixed. @jbrockmendel  xfail added, CI is now happy. can you merge master and we'll see if we can get this in @jbrockmendel Rebased and all green except one Windows job that timeouted. I think the edit to get_block_type in #34683 might fix the test that fails here.  can you confirm?  if that is fixed, presumably the rest of the EA test suite still needs to be enabled for this EA? > I think the edit to get_block_type in #34683 might fix the test that fails here. can you confirm? if that is fixed, presumably the rest of the EA test suite still needs to be enabled for this EA?

Yes, merging in #34683 fixes the test. 

I'm not sure whether it would be really worth to get the full suite running for this test EA. It is basically here to check for the regression but getting the whole suite to pass would be a lot more work that I don't see worthwhile currently. > I'm not sure whether it would be really worth to get the full suite running for this test EA. It is basically here to check for the regression but getting the whole suite to pass would be a lot more work that I don't see worthwhile currently.

totally reasonable.  i guess we can merge this now and then if/when #34683 makes this pass we can revisit getting other bits working.

cc @jreback @xhochy can you merge master, hopefully we'll get the CI green and can get this in Hello @xhochy! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:



There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2021-01-14 13:50:47 UTC This pull request is stale because it has been open for thirty days with no activity. Please update or respond to this comment if you're still interested in working on this. @jbrockmendel @jreback Rebased and removed xfail as it is working now. thanks @xhochy 