Make sure all dates are in UTC (#1139)

app/Cron/Hourly/DeletePireps.php

@@ -37,7 +37,7 @@ class DeletePireps extends Listener
      */
     protected function deletePireps(int $expire_time_hours, int $state)
     {
-        $dt = Carbon::now()->subHours($expire_time_hours);
+        $dt = Carbon::now('UTC')->subHours($expire_time_hours);
         $pireps = Pirep::where('created_at', '<', $dt)->where(['state' => $state])->get();
 
         /** @var PirepService $pirepSvc */

app/Cron/Hourly/RemoveExpiredBids.php

@@ -25,7 +25,7 @@ class RemoveExpiredBids extends Listener
             return;
         }
 
-        $date = Carbon::now()->subHours(setting('bids.expire_time'));
+        $date = Carbon::now('UTC')->subHours(setting('bids.expire_time'));
         Bid::where('created_at', '<', $date)->delete();
     }
 }

app/Cron/Hourly/RemoveExpiredLiveFlights.php

@@ -26,7 +26,7 @@ class RemoveExpiredLiveFlights extends Listener
             return;
         }
 
-        $date = Carbon::now()->subHours(setting('acars.live_time'));
+        $date = Carbon::now('UTC')->subHours(setting('acars.live_time'));
         Pirep::where('updated_at', '<', $date)
             ->where('state', PirepState::IN_PROGRESS)
             ->delete();