astahlman opened a new pull request #4893: [DRAFT] [AIRFLOW-3891] Make the Graph View time-zone aware URL: https://github.com/apache/airflow/pull/4893 Note: this PR isn't fit to be merged, as it only addresses the Graph view page. I'm sharing this for early review to make sure it's on the right track. If there are no major objections to this approach, then I'll apply similar changes to the other views. Make sure you have checked _all_ steps below. ### Jira - [ X ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-3891 - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue. - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)). ### Description - [ X ] Here are some details about my PR, including screenshots of any UI changes: The clock element in the navbar is now a drop-down that allows time-zone selection from two options: 'UTC' or 'Local' (the browser default). The default is UTC, and this selection does not persist across page refreshes. I'm open to suggestions here on whether the time-zone selection should be "sticky", and if so, what's the right way to make it so. The `Base date:` datetimepicker requires a bit of hackery, since the datetimepicker element bundled with Flask-AppBuilder doesn't seem to have time zone support (see [1]). To work around this, we have to add an offset to the (UTC) value in the picker so that the date string displayed in the picker appears to be in the selected time zone, then subtract the offset when we read the actual (UTC) value from the picker. [1] https://github.com/dpgaspar/Flask-AppBuilder/issues/920 ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: Front-end changes only ### 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 - [ ] 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. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release ### Code Quality - [ X ] Passes `flake8`
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