diff --git a/src/utils/date.test.ts b/src/utils/date.test.ts
new file mode 100644
index 0000000..55a880d
--- /dev/null
+++ b/src/utils/date.test.ts
@@ -0,0 +1,12 @@
+import { formatLeaderboardTimestamp } from './date';
+
+describe('Leaderboard Timestamp Utilities', () => {
+  it('should return empty string for empty input', () => {
+    expect(formatLeaderboardTimestamp('')).toBe('');
+  });
+
+  it('should format valid timestamp', () => {
+    const res = formatLeaderboardTimestamp('2026-08-06T12:00:00Z');
+    expect(res).toBeTruthy();
+  });
+});
diff --git a/src/utils/date.ts b/src/utils/date.ts
new file mode 100644
index 0000000..2ff81f2
--- /dev/null
+++ b/src/utils/date.ts
@@ -0,0 +1,13 @@
+export function formatLeaderboardTimestamp(timestamp: string | number | Date): string {
+  if (!timestamp) return '';
+  try {
+    const date = new Date(timestamp);
+    if (isNaN(date.getTime())) return '';
+    return new Intl.DateTimeFormat(navigator.language || 'en-US', {
+      dateStyle: 'medium',
+      timeStyle: 'short'
+    }).format(date);
+  } catch (err) {
+    return new Date(timestamp).toISOString();
+  }
+}