diff --git a/web/lib/champion-data.js b/web/lib/champion-data.js
index a524bb8..ee197e2 100644
--- a/web/lib/champion-data.js
+++ b/web/lib/champion-data.js
@@ -70,9 +70,13 @@ function hashString(str) {
   return hash >>> 0;
 }
 
-/** Get today's date string for daily seed */
+/** Get today's local date string for daily seed */
 export function getTodaySeed() {
-  return new Date().toISOString().slice(0, 10);
+  const now = new Date();
+  const year = now.getFullYear();
+  const month = String(now.getMonth() + 1).padStart(2, "0");
+  const day = String(now.getDate()).padStart(2, "0");
+  return `${year}-${month}-${day}`;
 }
 
 /** Get champion image URL from Data Dragon CDN */