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Remove incorrect start_date template variable from documentation, TypedDict, and template context validation #62505

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Remove incorrect start_date template variable from documentation, TypedDict, and template context validation #62505

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emplate_variable_start_date_doesnt_exist
Ajay9704 Feb 26, 2026
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Merge branch 'main' into template_variable_start_date_doesnt_exist
Ajay9704 Feb 26, 2026
67b96f0
Merge branch 'main' into template_variable_start_date_doesnt_exist
Ajay9704 Feb 26, 2026
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Merge branch 'main' into template_variable_start_date_doesnt_exist
Ajay9704 Feb 26, 2026
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Merge branch 'main' into template_variable_start_date_doesnt_exist
Ajay9704 Feb 26, 2026
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3 changes: 1 addition & 2 deletions airflow-core/docs/templates-ref.rst
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Expand Up @@ -70,8 +70,7 @@ Variable Type Description
``{{ prev_start_date_success }}`` `pendulum.DateTime`_ Start date from prior successful :class:`~airflow.models.dagrun.DagRun` (if available).
| ``None``
``{{ prev_end_date_success }}`` `pendulum.DateTime`_ End date from prior successful :class:`~airflow.models.dagrun.DagRun` (if available).
| ``None``
``{{ start_date }}`` `pendulum.DateTime`_ Datetime of when current task has been started.
| ``None``
``{{ inlets }}`` list List of inlets declared on the task.
``{{ inlet_events }}`` dict[str, ...] Access past events of inlet assets. See :doc:`Assets <authoring-and-scheduling/asset-scheduling>`. Added in version 2.10.
``{{ outlets }}`` list List of outlets declared on the task.
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2 changes: 1 addition & 1 deletion scripts/ci/prek/check_template_context_variable_in_sync.py
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Expand Up @@ -154,7 +154,7 @@ def _compare_keys(retn_keys: set[str], hint_keys: set[str], docs_keys: set[str])
docs_keys.update(("exception", "reason", "try_number"))

# Airflow 3 added:
retn_keys.update(("start_date", "task_reschedule_count"))
retn_keys.add("task_reschedule_count")
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@obarisk obarisk Mar 3, 2026

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what't the difference between add and update?


check_candidates = [
("get_template_context()", retn_keys),
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1 change: 0 additions & 1 deletion task-sdk/src/airflow/sdk/definitions/context.py
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Expand Up @@ -65,7 +65,6 @@ class Context(TypedDict, total=False):
prev_end_date_success: NotRequired[DateTime | None]
reason: NotRequired[str | None]
run_id: str
start_date: DateTime | None
# TODO: Remove Operator from below once we have MappedOperator to the Task SDK
# and once we can remove context related code from the Scheduler/models.TaskInstance
task: BaseOperator | Operator
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