title: How can I set different schedules for the same DAG based on different days in Airflow
body: <p>I've got two DAGs that are defined like something like this</p>
  <pre><code>my_dag= DAG('my_dag_thu_and_friday',
             catchup=False,
             default_args=default_args,
             schedule_interval='0 12,13,15,19 * * THU,FRI'
           ) 
  </code></pre>
  <pre><code>my_dag= DAG('my_dag_sat_and_sun',
             catchup=False,
             default_args=default_args,
             schedule_interval='0 13,17 * * SAT,SUN'
           ) 
  </code></pre>
  <p>They run the same operator and the same code but just on different schedules based on whether it is Thu/Fri or Sat/Sun. Is there a away I can specify the cron interval in such a way that I only have one DAG that handles scheduling conditionally?</p>
  <p>Thanks</p>