[GitHub] [airflow] enriqueayala opened a new issue #18559: dag_run.start_date not available from SubDag

[GitBox]

enriqueayala opened a new issue #18559:
URL: https://github.com/apache/airflow/issues/18559


   ### Apache Airflow version
   
   2.1.4 (latest released)
   
   ### Operating System
   
   Ubuntu 20.04
   
   ### Versions of Apache Airflow Providers
   
   _No response_
   
   ### Deployment
   
   Virtualenv installation
   
   ### Deployment details
   
   _No response_
   
   ### What happened
   
   Access to dag_run.start_date attribute from subdag returns `None`. 
   
   ### What you expected to happen
   
   Return DagRun.start_date of parent_dag (working on 2.1.0)
   
   ### How to reproduce
   
   Modify example_dags\subdags\subdag.py to : 
   ```
   from airflow import DAG
   from airflow.operators.bash import BashOperator
   from airflow.utils.dates import days_ago
   
   
   def subdag(parent_dag_name, child_dag_name, args):
       with DAG(
           dag_id=f'{parent_dag_name}.{child_dag_name}',
           default_args=args,
           start_date=days_ago(2),
           schedule_interval="@daily",
       ) as dag_subdag:
           
           t1 = BashOperator(
               task_id='echo_execution_date',
               bash_command='echo "{{dag_run.execution_date}}"',
           )
           t2 = BashOperator(
               task_id='echo_start_date',
               bash_command='echo "{{dag_run.start_date}}"',
           )
   
           t1 >> t2
   
       return dag_subdag
   ```
   
![dag_run_start_date](https://user-images.githubusercontent.com/10963531/134992336-fa6035d4-8504-44f0-b5d2-890690b9ab5d.PNG)
   
   
![dag_run_exec_date](https://user-images.githubusercontent.com/10963531/134992299-4bd00a10-0b22-44aa-b9e0-8f903133eb04.PNG)
   
   
   
   ### Anything else
   
   It also occurs within a task through context. 
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
   


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