diff --git a/frontend/src/components/pages/IvantiCountsChart.js b/frontend/src/components/pages/IvantiCountsChart.js
index 3f3473f..c30b8fb 100644
--- a/frontend/src/components/pages/IvantiCountsChart.js
+++ b/frontend/src/components/pages/IvantiCountsChart.js
@@ -170,13 +170,15 @@ function ArchiveTooltip({ active, payload, label }) {
 }
 
 // ---------------------------------------------------------------------------
-// Shorten YYYY-MM-DD to MM/DD/YY
+// Shorten YYYY-MM-DD (or ISO datetime) to MM/DD/YY
 // ---------------------------------------------------------------------------
 function fmtDate(d) {
     if (!d) return '';
-    const p = d.split('-');
+    // Handle ISO datetime strings (e.g. "2026-05-12T06:00:00.000Z") — extract date part first
+    const dateStr = String(d).split('T')[0];
+    const p = dateStr.split('-');
     if (p.length === 3) return `${p[1]}/${p[2]}/${p[0].slice(2)}`;
-    return d;
+    return dateStr;
 }
 
 // Extract YYYY-MM-DD from a datetime string