title: Schedule tasks at fixed time in multiple timezones
body: <p>I'm getting started with Airflow and I'm not sure how to approach this problem:</p>
  <p>I'm building a data export system that should run at a fixed time daily for different locations. My issue is that the locations have several timezones and the definition of day start/end changes depending on the timezone.</p>
  <p>I saw in the documentation that I can make a dag timezone aware but I'm not sure creating 100s of dags with different timezone is the right approach. I also have some common tasks so multiple dags creates more complexity or duplication in the tasks performed.</p>
  <p>Is there an airflow idiomatic way to achieve this? I think it would be a fairly common use case to build reports that are timezone dependant but I didn't find any informations about it.</p>