In a recent post, Eugene Yan describes a discussion that revealed a blind spot in his own expertise: Airflow jobs that seem to run "one day late" are often misunderstood. The title question—"Why Are My Airflow Jobs Running 'One Day Late'?"—gets a direct answer: Airflow is not late.
The post's explanation centers on how Airflow defines a job's schedule. The apparent delay is a product of the platform's scheduling model, not a bug or timezone issue. Yan notes that this confusion can persist even among experienced users, which is why he calls it an expert blind spot.
The key takeaway is that the behavior is intentional. Once you understand the semantics, the "one day late" appearance becomes expected. The post serves as a reminder that infrastructure tools often have subtle conventions that are easy to misread.