diff --git a/ui/src/components/door_map/calendar.ts b/ui/src/components/door_map/calendar.ts
index 0b22a67..035b230 100644
--- a/ui/src/components/door_map/calendar.ts
+++ b/ui/src/components/door_map/calendar.ts
@@ -14,6 +14,6 @@ export class Door {
   }
 
   public set day(day: number) {
-    this._day = Math.max(day, -1);
+    this._day = Math.max(Math.floor(day), -1);
   }
 }
\ No newline at end of file