Fix google tasks due date timezone handling

homeassistant/components/google_tasks/todo.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from datetime import date, datetime, timedelta
+from datetime import UTC, date, datetime, timedelta
 from typing import Any, cast
 
 from homeassistant.components.todo import (
@@ -39,8 +39,10 @@ def _convert_todo_item(item: TodoItem) -> dict[str, str | None]:
     else:
         result["status"] = TodoItemStatus.NEEDS_ACTION
     if (due := item.due) is not None:
-        # due API field is a timestamp string, but with only date resolution
-        result["due"] = dt_util.start_of_local_day(due).isoformat()
+        # due API field is a timestamp string, but with only date resolution.
+        # The time portion of the date is always discarded by the API, so we
+        # always set to UTC.
+        result["due"] = dt_util.start_of_local_day(due).replace(tzinfo=UTC).isoformat()
     else:
         result["due"] = None
     result["notes"] = item.description
@@ -51,6 +53,8 @@ def _convert_api_item(item: dict[str, str]) -> TodoItem:
     """Convert tasks API items into a TodoItem."""
     due: date | None = None
     if (due_str := item.get("due")) is not None:
+        # Due dates are returned always in UTC so we only need to
+        # parse the date portion which will be interpreted as a a local date.
         due = datetime.fromisoformat(due_str).date()
     return TodoItem(
         summary=item["title"],

tests/components/google_tasks/snapshots/test_todo.ambr

@@ -15,7 +15,7 @@
   )
 # ---
 # name: test_create_todo_list_item[due].1
-  '{"title": "Soda", "status": "needsAction", "due": "2023-11-18T00:00:00-08:00", "notes": null}'
+  '{"title": "Soda", "status": "needsAction", "due": "2023-11-18T00:00:00+00:00", "notes": null}'
 # ---
 # name: test_create_todo_list_item[summary]
   tuple(
@@ -137,7 +137,7 @@
   )
 # ---
 # name: test_partial_update[due_date].1
-  '{"title": "Water", "status": "needsAction", "due": "2023-11-18T00:00:00-08:00", "notes": null}'
+  '{"title": "Water", "status": "needsAction", "due": "2023-11-18T00:00:00+00:00", "notes": null}'
 # ---
 # name: test_partial_update[empty_description]
   tuple(
@@ -166,6 +166,33 @@
 # name: test_partial_update_status[api_responses0].1
   '{"title": "Water", "status": "needsAction", "due": null, "notes": null}'
 # ---
+# name: test_update_due_date[api_responses0-America/Regina]
+  tuple(
+    'https://tasks.googleapis.com/tasks/v1/lists/task-list-id-1/tasks/some-task-id?alt=json',
+    'PATCH',
+  )
+# ---
+# name: test_update_due_date[api_responses0-America/Regina].1
+  '{"title": "Water", "status": "needsAction", "due": "2024-12-05T00:00:00+00:00", "notes": null}'
+# ---
+# name: test_update_due_date[api_responses0-Asia/Tokyo]
+  tuple(
+    'https://tasks.googleapis.com/tasks/v1/lists/task-list-id-1/tasks/some-task-id?alt=json',
+    'PATCH',
+  )
+# ---
+# name: test_update_due_date[api_responses0-Asia/Tokyo].1
+  '{"title": "Water", "status": "needsAction", "due": "2024-12-05T00:00:00+00:00", "notes": null}'
+# ---
+# name: test_update_due_date[api_responses0-UTC]
+  tuple(
+    'https://tasks.googleapis.com/tasks/v1/lists/task-list-id-1/tasks/some-task-id?alt=json',
+    'PATCH',
+  )
+# ---
+# name: test_update_due_date[api_responses0-UTC].1
+  '{"title": "Water", "status": "needsAction", "due": "2024-12-05T00:00:00+00:00", "notes": null}'
+# ---
 # name: test_update_todo_list_item[api_responses0]
   tuple(
     'https://tasks.googleapis.com/tasks/v1/lists/task-list-id-1/tasks/some-task-id?alt=json',

tests/components/google_tasks/test_todo.py

@@ -239,6 +239,7 @@ def mock_http_response(response_handler: list | Callable) -> Mock:
         yield mock_response
 
 
+@pytest.mark.parametrize("timezone", ["America/Regina", "UTC", "Asia/Tokyo"])
 @pytest.mark.parametrize(
     "api_responses",
     [
@@ -251,7 +252,7 @@ def mock_http_response(response_handler: list | Callable) -> Mock:
                         "title": "Task 1",
                         "status": "needsAction",
                         "position": "0000000000000001",
-                        "due": "2023-11-18T00:00:00+00:00",
+                        "due": "2023-11-18T00:00:00Z",
                     },
                     {
                         "id": "task-2",
@@ -271,8 +272,10 @@ async def test_get_items(
     integration_setup: Callable[[], Awaitable[bool]],
     hass_ws_client: WebSocketGenerator,
     ws_get_items: Callable[[], Awaitable[dict[str, str]]],
+    timezone: str,
 ) -> None:
     """Test getting todo list items."""
+    await hass.config.async_set_time_zone(timezone)
 
     assert await integration_setup()
 
@@ -484,6 +487,39 @@ async def test_update_todo_list_item(
     assert call.kwargs.get("body") == snapshot
 
 
+@pytest.mark.parametrize("timezone", ["America/Regina", "UTC", "Asia/Tokyo"])
+@pytest.mark.parametrize("api_responses", [UPDATE_API_RESPONSES])
+async def test_update_due_date(
+    hass: HomeAssistant,
+    setup_credentials: None,
+    integration_setup: Callable[[], Awaitable[bool]],
+    mock_http_response: Any,
+    snapshot: SnapshotAssertion,
+    timezone: str,
+) -> None:
+    """Test for updating the due date of a To-do item and timezone."""
+    await hass.config.async_set_time_zone(timezone)
+
+    assert await integration_setup()
+
+    state = hass.states.get("todo.my_tasks")
+    assert state
+    assert state.state == "1"
+
+    await hass.services.async_call(
+        TODO_DOMAIN,
+        TodoServices.UPDATE_ITEM,
+        {ATTR_ITEM: "some-task-id", ATTR_DUE_DATE: "2024-12-5"},
+        target={ATTR_ENTITY_ID: "todo.my_tasks"},
+        blocking=True,
+    )
+    assert len(mock_http_response.call_args_list) == 4
+    call = mock_http_response.call_args_list[2]
+    assert call
+    assert call.args == snapshot
+    assert call.kwargs.get("body") == snapshot
+
+
 @pytest.mark.parametrize(
     "api_responses",
     [