Fix blocking call inside the event loop (#89)

* Fix blocking call inside the event loop

* Adjust

custom_components/rte_ecowatt/__init__.py

@@ -3,7 +3,7 @@
 import json
 import urllib.parse
 import logging
-from datetime import timedelta, datetime
+from datetime import datetime, timedelta, tzinfo
 from zoneinfo import ZoneInfo
 from typing import Any, Dict, Optional, Tuple
 from dateutil import tz
@@ -27,6 +27,7 @@
 from homeassistant.helpers.httpx_client import get_async_client
 from homeassistant.components.sensor import RestoreSensor
 from homeassistant.components.calendar import CalendarEntity, CalendarEvent
+from homeassistant.util import dt as dt_util
 
 from .const import (
     CONF_CLIENT_ID,
@@ -133,9 +134,8 @@ async def async_oauth_client(self):
         self.token = client.token
         return client
 
-    def _timezone(self):
-        timezone = self.hass.config.as_dict()["time_zone"]
-        return tz.gettz(timezone)
+    def _timezone(self) -> tzinfo:
+        return dt_util.get_default_time_zone()
 
     def skip_refresh(self) -> Optional[str]:
         """
@@ -407,9 +407,8 @@ def __init__(
         }
         self._attr_extra_state_attributes["options"] = list(self.options.values()) + ["Coupure d'électricité en cours"]
 
-    def _timezone(self):
-        timezone = self.hass.config.as_dict()["time_zone"]
-        return tz.gettz(timezone)
+    def _timezone(self) -> tzinfo:
+        return dt_util.get_default_time_zone()
 
     def _find_ecowatt_level(self) -> Optional[int]:
         raise NotImplementedError()