Fix calculation of Starlink sleep end setting (#115507)

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/starlink/coordinator.py

@@ -119,12 +119,16 @@ class StarlinkUpdateCoordinator(DataUpdateCoordinator[StarlinkData]):
 
     async def async_set_sleep_duration(self, end: int) -> None:
         """Set Starlink system sleep schedule end time."""
+        duration = end - self.data.sleep[0]
+        if duration < 0:
+            # If the duration pushed us into the next day, add one days worth to correct that.
+            duration += 1440
         async with asyncio.timeout(4):
             try:
                 await self.hass.async_add_executor_job(
                     set_sleep_config,
                     self.data.sleep[0],
-                    end,
+                    duration,
                     self.data.sleep[2],
                     self.channel_context,
                 )

homeassistant/components/starlink/time.py

@@ -62,6 +62,8 @@ class StarlinkTimeEntity(StarlinkEntity, TimeEntity):
 
 def _utc_minutes_to_time(utc_minutes: int, timezone: tzinfo) -> time:
     hour = math.floor(utc_minutes / 60)
+    if hour > 23:
+        hour -= 24
     minute = utc_minutes % 60
     try:
         utc = datetime.now(UTC).replace(