Fix for breaking change in HA

custom_components/o365/calendar.py

@@ -5,11 +5,13 @@
 from datetime import datetime, timedelta
 from operator import attrgetter, itemgetter
 
-from homeassistant.components.calendar import (
-    CalendarEventDevice,
-    calculate_offset,
-    is_offset_reached,
-)
+from homeassistant.components.calendar import CalendarEventDevice, is_offset_reached
+
+try:
+    from homeassistant.components.calendar import calculate_offset
+except ImportError:
+    from homeassistant.components.calendar import extract_offset
+
 from homeassistant.helpers.entity import generate_entity_id
 from homeassistant.util import Throttle, dt
 
@@ -166,8 +168,15 @@ async def async_update(self):
         await self.data.async_update(self.hass)
         event = copy.deepcopy(self.data.event)
         if event:
-            event = calculate_offset(event, DEFAULT_OFFSET)
-            self._offset_reached = is_offset_reached(event)
+            try:
+                event = calculate_offset(event, DEFAULT_OFFSET)
+                self._offset_reached = is_offset_reached(event)
+            except NameError:
+                event["summary"], offset = extract_offset(
+                    event.get("summary", ""), DEFAULT_OFFSET
+                )
+                start = dt.parse_datetime(event["start"])
+                self._offset_reached = is_offset_reached(start, offset)
         events = list(
             await self.data.async_o365_get_events(
                 self.hass,