How does Airflow schedule Daylight Saving Time?
One morning you find out your favorite Airflow DAG did not ran that night. Sad… Six months later the task ran twice and now you understand: you scheduled your DAG timezone aware and the clock goes back and forth sometimes because of Daylight Saving Time. For example, in Central European Time (CET) on Sunday 29 March 2020, 02:00, the clocks were turned from “local standard time” forward 1 hour to 03:00:00 “local daylight time”. And recently, on Sunday 25 October 2020, 03:00 the clocks were turned from “local daylight time” backward 1 hour to “local standard time” instead. That means that any activity between 02:00 and 03:00 will not exist, or exists twice. ...