diff --git a/public/js/utils/helpers.js b/public/js/utils/helpers.js
index 7aadfef..ec4d9b8 100644
--- a/public/js/utils/helpers.js
+++ b/public/js/utils/helpers.js
@@ -4,11 +4,10 @@
  */
 
 export function formatDate(date) {
-    const d = new Date(date);
-    const month = String(d.getMonth() + 1).padStart(2, '0');
-    const day = String(d.getDate()).padStart(2, '0');
-    const year = d.getFullYear();
-    return `${month}/${day}/${year}`;
+    if (!date) return '—';
+    const parts = String(date).split('T')[0].split('-');
+    if (parts.length !== 3) return String(date);
+    return `${parts[1]}/${parts[2]}/${parts[0]}`;
 }
 
 export function setDefaultDate() {
diff --git a/public/js/views/accounting-view.js b/public/js/views/accounting-view.js
index 573968d..af958c7 100644
--- a/public/js/views/accounting-view.js
+++ b/public/js/views/accounting-view.js
@@ -881,7 +881,8 @@ function renderTaxPeriodsTable() {
         else if (pStatus === 'external' || pStatus === 'paid') { statusHtml = 'Paid'; statusColor = 'bg-green-100 text-green-800'; }
         else                            { statusHtml = 'Open';     statusColor = 'bg-yellow-100 text-yellow-800'; }
 
-        const monthLabel = new Date(p.period_start).toLocaleDateString('en-US', { year: 'numeric', month: 'long' });
+        const [py, pm] = String(p.period_start).split('T')[0].split('-');
+        const monthLabel = new Date(Number(py), Number(pm) - 1).toLocaleDateString('en-US', { year: 'numeric', month: 'long', timeZone: 'UTC' });
         const adj = parseFloat(p.adjustment_amount) || 0;
         const adjStr = adj !== 0 ? (adj > 0 ? `−$${adj.toFixed(2)}` : `+$${Math.abs(adj).toFixed(2)}`) : '—';
         const netPaid = parseFloat(p.net_paid) || parseFloat(p.tax_collected) || 0;
@@ -970,7 +971,7 @@ async function openTaxPeriodDetail(startDate, endDate, existingPeriod) {
 
     const today = todayISO();
     const [y, m] = startDate.split('-').map(Number);
-    const monthLabel = new Date(y, m - 1).toLocaleDateString('en-US', { year: 'numeric', month: 'long' });
+    const monthLabel = new Date(y, m - 1).toLocaleDateString('en-US', { year: 'numeric', month: 'long', timeZone: 'UTC' });
 
     detailEl.innerHTML = `
         <div class="bg-white rounded-lg shadow-sm border border-gray-200 p-4">
diff --git a/src/utils/helpers.js b/src/utils/helpers.js
index 09bb0ad..d9745ef 100644
--- a/src/utils/helpers.js
+++ b/src/utils/helpers.js
@@ -3,11 +3,10 @@
  */
 
 function formatDate(date) {
-    const d = new Date(date);
-    const month = String(d.getMonth() + 1).padStart(2, '0');
-    const day = String(d.getDate()).padStart(2, '0');
-    const year = d.getFullYear();
-    return `${month}/${day}/${year}`;
+    if (!date) return '—';
+    const parts = String(date).split('T')[0].split('-');
+    if (parts.length !== 3) return String(date);
+    return `${parts[1]}/${parts[2]}/${parts[0]}`;
 }
 
 function formatMoney(val) {