Use native datetime value inMobile App sensors (#59945)

homeassistant/components/mobile_app/sensor.py

@@ -2,10 +2,17 @@
 from __future__ import annotations
 
 from homeassistant.components.sensor import SensorEntity
-from homeassistant.const import CONF_NAME, CONF_UNIQUE_ID, CONF_WEBHOOK_ID
+from homeassistant.const import (
+    CONF_NAME,
+    CONF_UNIQUE_ID,
+    CONF_WEBHOOK_ID,
+    DEVICE_CLASS_DATE,
+    DEVICE_CLASS_TIMESTAMP,
+)
 from homeassistant.core import callback
 from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
+from homeassistant.util import dt as dt_util
 
 from .const import (
     ATTR_DEVICE_NAME,
@@ -81,7 +88,20 @@ class MobileAppSensor(MobileAppEntity, SensorEntity):
     @property
     def native_value(self):
         """Return the state of the sensor."""
-        return self._config[ATTR_SENSOR_STATE]
+        if (
+            (state := self._config[ATTR_SENSOR_STATE]) is not None
+            and self.device_class
+            in (
+                DEVICE_CLASS_DATE,
+                DEVICE_CLASS_TIMESTAMP,
+            )
+            and (timestamp := dt_util.parse_datetime(state)) is not None
+        ):
+            if self.device_class == DEVICE_CLASS_DATE:
+                return timestamp.date()
+            return timestamp
+
+        return state
 
     @property
     def native_unit_of_measurement(self):