Fix datetime parameter validation for list events (#95778)

homeassistant/components/calendar/__init__.py

@@ -264,8 +264,8 @@ SERVICE_LIST_EVENTS_SCHEMA: Final = vol.All(
     cv.has_at_most_one_key(EVENT_END_DATETIME, EVENT_DURATION),
     cv.make_entity_service_schema(
         {
-            vol.Optional(EVENT_START_DATETIME): datetime.datetime,
-            vol.Optional(EVENT_END_DATETIME): datetime.datetime,
+            vol.Optional(EVENT_START_DATETIME): cv.datetime,
+            vol.Optional(EVENT_END_DATETIME): cv.datetime,
             vol.Optional(EVENT_DURATION): vol.All(
                 cv.time_period, cv.positive_timedelta
             ),

homeassistant/components/demo/calendar.py

@@ -67,6 +67,14 @@ class DemoCalendar(CalendarEntity):
         end_date: datetime.datetime,
     ) -> list[CalendarEvent]:
         """Return calendar events within a datetime range."""
+        if start_date.tzinfo is None:
+            start_date = start_date.replace(
+                tzinfo=dt_util.get_time_zone(hass.config.time_zone)
+            )
+        if end_date.tzinfo is None:
+            end_date = end_date.replace(
+                tzinfo=dt_util.get_time_zone(hass.config.time_zone)
+            )
         assert start_date < end_date
         if self._event.start_datetime_local >= end_date:
             return []