ashb opened a new pull request #4186: [AIRFLOW-3339] Correctly get DAG timezone when start_date in default_args URL: https://github.com/apache/incubator-airflow/pull/4186 Make sure you have checked _all_ steps below. ### Jira - [x] https://issues.apache.org/jira/browse/AIRFLOW-3339 ### Description - [x] If you create a DAG like this: ``` DAG( default_args={ 'start_date': datetime.datetime(2018, 9, 1), }, ) ``` It would fail to correctly set `self.timezone` (as the start date was naive/timezone-less) - this fixes it ### Tests - [x] Simple test added ### Commits - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added. ### Code Quality - [x] Passes `flake8`
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