From 517fda1383fc4041699aa284eb0850d5fb989888 Mon Sep 17 00:00:00 2001
From: Erik Montnemery <erik@montnemery.com>
Date: Wed, 25 Aug 2021 15:24:51 +0200
Subject: [PATCH] Fix last_reset in utility_meter (#55209)

---
 homeassistant/components/utility_meter/sensor.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/homeassistant/components/utility_meter/sensor.py b/homeassistant/components/utility_meter/sensor.py
index e8d938928dd..e0bd33006d3 100644
--- a/homeassistant/components/utility_meter/sensor.py
+++ b/homeassistant/components/utility_meter/sensor.py
@@ -6,6 +6,7 @@ import logging
 import voluptuous as vol
 
 from homeassistant.components.sensor import (
+    ATTR_LAST_RESET,
     STATE_CLASS_MEASUREMENT,
     STATE_CLASS_TOTAL_INCREASING,
     SensorEntity,
@@ -58,7 +59,6 @@ ATTR_SOURCE_ID = "source"
 ATTR_STATUS = "status"
 ATTR_PERIOD = "meter_period"
 ATTR_LAST_PERIOD = "last_period"
-ATTR_LAST_RESET = "last_reset"
 ATTR_TARIFF = "tariff"
 
 DEVICE_CLASS_MAP = {
@@ -357,7 +357,6 @@ class UtilityMeterSensor(RestoreEntity, SensorEntity):
             ATTR_SOURCE_ID: self._sensor_source_id,
             ATTR_STATUS: PAUSED if self._collecting is None else COLLECTING,
             ATTR_LAST_PERIOD: self._last_period,
-            ATTR_LAST_RESET: self._last_reset.isoformat(),
         }
         if self._period is not None:
             state_attr[ATTR_PERIOD] = self._period
@@ -369,3 +368,8 @@ class UtilityMeterSensor(RestoreEntity, SensorEntity):
     def icon(self):
         """Return the icon to use in the frontend, if any."""
         return ICON
+
+    @property
+    def last_reset(self):
+        """Return the time when the sensor was last reset."""
+        return self._last_reset