Fix date observed is not sent by AirNow (#101921) (#101977)

* Fix mixed up keys

These were accidentally the wrong values, but never passed on
to the end user.

* Fix date observed is not sent by AirNow (#101921)

homeassistant/components/airnow/sensor.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from dataclasses import dataclass
+from datetime import datetime
 from typing import Any
 
 from homeassistant.components.sensor import (
@@ -13,6 +14,7 @@ from homeassistant.components.sensor import (
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
+    ATTR_TIME,
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_MILLION,
 )
@@ -21,6 +23,7 @@ from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import StateType
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
+from homeassistant.util.dt import get_time_zone
 
 from . import AirNowDataUpdateCoordinator
 from .const import (
@@ -29,6 +32,9 @@ from .const import (
     ATTR_API_AQI_LEVEL,
     ATTR_API_O3,
     ATTR_API_PM25,
+    ATTR_API_REPORT_DATE,
+    ATTR_API_REPORT_HOUR,
+    ATTR_API_REPORT_TZ,
     ATTR_API_STATION,
     ATTR_API_STATION_LATITUDE,
     ATTR_API_STATION_LONGITUDE,
@@ -78,6 +84,12 @@ SENSOR_TYPES: tuple[AirNowEntityDescription, ...] = (
         extra_state_attributes_fn=lambda data: {
             ATTR_DESCR: data[ATTR_API_AQI_DESCRIPTION],
             ATTR_LEVEL: data[ATTR_API_AQI_LEVEL],
+            ATTR_TIME: datetime.strptime(
+                f"{data[ATTR_API_REPORT_DATE]} {data[ATTR_API_REPORT_HOUR]}",
+                "%Y-%m-%d %H",
+            )
+            .replace(tzinfo=get_time_zone(data[ATTR_API_REPORT_TZ]))
+            .isoformat(),
         },
     ),
     AirNowEntityDescription(