#Airflow custom dag execution schedule

airflow_custom_execution_schedule.py

def _skipcondition(execution_date, **_):
    first_valid_friday = datetime(2021, 4, 9)
    return (execution_date - first_valid_friday).days % 14 == 0
    
with DAG(dag_id='fortnightSchedule',default_args = default_args, schedule_interval = "0 17 * * 5", catchup=False) as dag:
    check_valid_friday = ShortCircuitOperator(
        task_id="check_if_correct_friday",
        python_callable=_skipcondition,
        provide_context=True,
        )
        
    rest_of_tasks = DummyOperator(
        task_id="dependent_dummy",
    )
    
check_valid_friday >> rest_of_tasks