Change toUTCString to toISOString and change default to 365 days.

src/components/homesections/homesections.js

@@ -608,7 +608,7 @@ import ServerConnections from '../ServerConnections';
                 EnableImageTypes: 'Primary,Backdrop,Banner,Thumb',
                 EnableTotalRecordCount: false,
                 DisableFirstEpisode: false,
-                NextUpDateCutoff: oldestDateForNextUp.toUTCString()
+                NextUpDateCutoff: oldestDateForNextUp.toISOString()
             });
         };
     }

src/scripts/settings/userSettings.js

@@ -444,7 +444,7 @@ export class UserSettings {
             // Explicitly return 0 to avoid returning 100 because 0 is falsy.
             return 0;
         } else {
-            return maxDaysForNextUp || 100;
+            return maxDaysForNextUp || 365;
         }
     }