Fix offset-naive and offset-aware operation

[mdujava]

Fix: TypeError: can't subtract offset-naive and offset-aware datetimes

[openshift-ci]

Hi @mdujava. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[bradmwilliams]

/ok-to-test
/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bradmwilliams, mdujava

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[openshift-ci]

@mdujava: all tests passed!

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