BasPH commented on issue #5423: [AIRFLOW-3739] Remove start_date requirement on DAG URL: https://github.com/apache/airflow/pull/5423#issuecomment-503747818 Case 1: 👍 Case 2: Checked again, turns out it also has a default value on master. The schedule_interval argument default on DAG is `timedelta(days=1)` ([link](https://github.com/apache/airflow/blob/master/airflow/models/dag.py#L169)), and this prevails over the task_instance schedule_interval ([link](https://github.com/apache/airflow/blob/master/airflow/models/baseoperator.py#L540-L550)). These semantics feel weird to me.
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