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https://issues.apache.org/jira/browse/AIRFLOW-4933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ash Berlin-Taylor resolved AIRFLOW-4933.
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Resolution: Duplicate
> DAG init causes side effects on default args
> --------------------------------------------
>
> Key: AIRFLOW-4933
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4933
> Project: Apache Airflow
> Issue Type: Bug
> Components: DAG
> Affects Versions: 1.10.3
> Reporter: Richard Postelnik
> Priority: Trivial
>
> I have multiple dags defined in one file (understand this is not
> recommended). I shared the same default_args between two dags and found that
> the latter dag was running on UTC instead of the timezone of the start_date.
> Debugging, I found the following line convert the start_date to UTC in the
> DAG init and it must be doing it in-place. A deepcopy in the init should
> resolve this and allow a reusable set of defaults.
>
> [https://github.com/apache/airflow/blob/master/airflow/models/dag.py#L250]
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