Timedelta dag backfill dates don't align with normal schedule

[dstandish]

Body

With a timedelta-scheduled dag, the logical dates that you get are relative to the start-date you provide when running the backfill command.

This has been the behavior since 2.x

So, e.g. suppose your dag has schedule of timedelta(days=1). Then, running this

airflow dags backfill test_backfill_dag__timedelta --start-date '2025-03-10 03:25:26' --end-date 2025-03-13 --dry-run

Will produce these runs:

"2025-03-10 03:25:26+00:00"
"2025-03-11 03:25:26+00:00"
"2025-03-12 03:25:26+00:00"

But if the schedule was cron schedule, then it would be what you would expect -- just the "partitions" that are within the range requested.

Committer

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[vatsrahul1001]

Yeah we noticed this behaviour and reported in issue : #47670 . This might be already present in AF2. I need to test