diff --git a/ui/src/components/calendar/event.ts b/ui/src/components/calendar/event.ts
index d26f37b..be016cf 100644
--- a/ui/src/components/calendar/event.ts
+++ b/ui/src/components/calendar/event.ts
@@ -18,13 +18,11 @@ export default class Event {
   public get hash(): string {
     const str = JSON.stringify(this);
 
-    // from https://gist.github.com/jlevy/c246006675becc446360a798e2b2d781
+    // source: https://gist.github.com/hyamamoto/fd435505d29ebfa3d9716fd2be8d42f0?permalink_comment_id=2775538#gistcomment-2775538
     let hash = 0;
-    for (let i = 0; i < str.length; i++) {
-      const char = str.charCodeAt(i);
-      hash = (hash << 5) - hash + char;
-      hash &= hash; // Convert to 32bit integer
-    }
+    for (let i = 0; i < str.length; i++)
+      hash = Math.imul(31, hash) + str.charCodeAt(i) | 0;
+
     return new Uint32Array([hash])[0].toString(36);
   }
 }
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