diff --git a/web/admin.html b/web/admin.html
index 062ecbe..f8257ad 100644
--- a/web/admin.html
+++ b/web/admin.html
@@ -321,6 +321,50 @@
 
     <script src="shared.js"></script>
     <script>
+        function normalizeUtcDateString(dateStr) {
+            if (!dateStr) return null;
+            let utcDateStr = String(dateStr).trim();
+            if (!utcDateStr.includes('T')) {
+                utcDateStr = utcDateStr.replace(' ', 'T');
+            }
+            if (!/[zZ]|[+-]\d{2}:?\d{2}$/.test(utcDateStr)) {
+                utcDateStr += 'Z';
+            }
+            return utcDateStr;
+        }
+
+        function parseUtcDate(dateStr) {
+            const normalized = normalizeUtcDateString(dateStr);
+            return normalized ? new Date(normalized) : null;
+        }
+
+        function formatUtcDateInput(date) {
+            return date.toISOString().slice(0, 10);
+        }
+
+        function formatUtcTimeInput(date) {
+            return date.toISOString().slice(11, 16);
+        }
+
+        function formatTimeOnly(dateStr) {
+            const date = parseUtcDate(dateStr);
+            return date && !Number.isNaN(date.getTime()) ? formatUtcTimeInput(date) : '-';
+        }
+
+        function formatUtcDayMonth(dateStr) {
+            const date = parseUtcDate(dateStr);
+            if (!date || Number.isNaN(date.getTime())) return '-';
+            const isoDate = formatUtcDateInput(date);
+            return `${isoDate.slice(8, 10)}/${isoDate.slice(5, 7)}`;
+        }
+
+        function formatUtcWeekdayDayMonth(dateStr) {
+            const date = parseUtcDate(dateStr);
+            if (!date || Number.isNaN(date.getTime())) return '-';
+            const dayName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][date.getUTCDay()];
+            return `${dayName} ${formatUtcDayMonth(dateStr)}`;
+        }
+
         async function loadPPRs() {
             if (!accessToken) return;
             
diff --git a/web/atc.html b/web/atc.html
index e461565..709d992 100644
--- a/web/atc.html
+++ b/web/atc.html
@@ -300,6 +300,50 @@
 
     <script src="shared.js"></script>
     <script>
+        function normalizeUtcDateString(dateStr) {
+            if (!dateStr) return null;
+            let utcDateStr = String(dateStr).trim();
+            if (!utcDateStr.includes('T')) {
+                utcDateStr = utcDateStr.replace(' ', 'T');
+            }
+            if (!/[zZ]|[+-]\d{2}:?\d{2}$/.test(utcDateStr)) {
+                utcDateStr += 'Z';
+            }
+            return utcDateStr;
+        }
+
+        function parseUtcDate(dateStr) {
+            const normalized = normalizeUtcDateString(dateStr);
+            return normalized ? new Date(normalized) : null;
+        }
+
+        function formatUtcDateInput(date) {
+            return date.toISOString().slice(0, 10);
+        }
+
+        function formatUtcTimeInput(date) {
+            return date.toISOString().slice(11, 16);
+        }
+
+        function formatTimeOnly(dateStr) {
+            const date = parseUtcDate(dateStr);
+            return date && !Number.isNaN(date.getTime()) ? formatUtcTimeInput(date) : '-';
+        }
+
+        function formatUtcDayMonth(dateStr) {
+            const date = parseUtcDate(dateStr);
+            if (!date || Number.isNaN(date.getTime())) return '-';
+            const isoDate = formatUtcDateInput(date);
+            return `${isoDate.slice(8, 10)}/${isoDate.slice(5, 7)}`;
+        }
+
+        function formatUtcWeekdayDayMonth(dateStr) {
+            const date = parseUtcDate(dateStr);
+            if (!date || Number.isNaN(date.getTime())) return '-';
+            const dayName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][date.getUTCDay()];
+            return `${dayName} ${formatUtcDayMonth(dateStr)}`;
+        }
+
         async function loadPPRs() {
             if (!accessToken) return;