diff --git a/public/js/views/invoice-view.js b/public/js/views/invoice-view.js
index d6cca3c..c4e505a 100644
--- a/public/js/views/invoice-view.js
+++ b/public/js/views/invoice-view.js
@@ -589,42 +589,73 @@ async function checkStripePayment(invoiceId) {
 }
 
 async function editSentDates(invoiceId) {
-    // Load current invoice data
     const res = await fetch(`/api/invoices/${invoiceId}`);
     const data = await res.json();
     const invoice = data.invoice;
-    const sentDates = invoice.sent_dates || [];
+    const sentDates = (invoice.sent_dates || []).map(d => d.split('T')[0]);
 
-    // Build a simple prompt-based editor
-    let datesStr = sentDates.join('\n');
-    const input = prompt(
-        'Edit sent dates (one per line, YYYY-MM-DD format):\n\n' +
-        'Add a new line to add a date.\nRemove a line to delete a date.\nLeave empty to clear all.',
-        datesStr
-    );
+    // Build modal
+    let modal = document.getElementById('sent-dates-modal');
+    if (!modal) {
+        modal = document.createElement('div');
+        modal.id = 'sent-dates-modal';
+        modal.className = 'fixed inset-0 bg-black bg-opacity-50 z-50 flex justify-center items-center';
+        document.body.appendChild(modal);
+    }
 
-    if (input === null) return; // Cancelled
+    modal.innerHTML = `
+        <div class="bg-white rounded-lg shadow-2xl w-full max-w-sm mx-auto p-6">
+            <h3 class="text-lg font-bold text-gray-800 mb-4">Edit Sent Dates</h3>
+            <div id="sent-dates-list" class="space-y-2 mb-4"></div>
+            <button type="button" onclick="window.invoiceView._addSentDateRow()"
+                    class="text-sm text-blue-600 hover:text-blue-800 mb-4">+ Add date</button>
+            <div class="flex justify-end space-x-3 pt-4 border-t">
+                <button onclick="document.getElementById('sent-dates-modal').classList.add('hidden')"
+                        class="px-4 py-2 bg-gray-200 text-gray-700 rounded-md hover:bg-gray-300 text-sm">Cancel</button>
+                <button onclick="window.invoiceView._saveSentDates(${invoiceId})"
+                        class="px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 text-sm font-semibold">Save</button>
+            </div>
+        </div>`;
 
-    // Parse and validate
-    const newDates = input.trim()
-        ? input.trim().split('\n').map(d => d.trim()).filter(d => d)
-        : [];
+    const list = document.getElementById('sent-dates-list');
+    if (sentDates.length === 0) {
+        _addSentDateRow();
+    } else {
+        sentDates.forEach(d => _addSentDateRow(d));
+    }
 
-    for (const d of newDates) {
-        if (!/^\d{4}-\d{2}-\d{2}$/.test(d)) {
-            alert(`Invalid date: "${d}"\nPlease use YYYY-MM-DD format.`);
-            return;
-        }
+    modal.classList.remove('hidden');
+}
+
+function _addSentDateRow(value = '') {
+    const list = document.getElementById('sent-dates-list');
+    if (!list) return;
+
+    const row = document.createElement('div');
+    row.className = 'flex items-center gap-2';
+    row.innerHTML = `
+        <input type="date" value="${value}" class="sent-date-input flex-1 px-3 py-2 border border-gray-300 rounded-md text-sm focus:ring-blue-500 focus:border-blue-500">
+        <button type="button" onclick="this.parentElement.remove()" class="px-2 py-1 bg-red-100 text-red-600 rounded hover:bg-red-200 text-sm">×</button>`;
+    list.appendChild(row);
+}
+
+async function _saveSentDates(invoiceId) {
+    const inputs = document.querySelectorAll('#sent-dates-list .sent-date-input');
+    const dates = [];
+    
+    for (const input of inputs) {
+        if (input.value) dates.push(input.value);
     }
 
     try {
         const response = await fetch(`/api/invoices/${invoiceId}/sent-dates`, {
             method: 'PATCH',
             headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify({ sent_dates: newDates })
+            body: JSON.stringify({ sent_dates: dates })
         });
 
         if (response.ok) {
+            document.getElementById('sent-dates-modal').classList.add('hidden');
             loadInvoices();
         } else {
             const err = await response.json();
@@ -632,7 +663,7 @@ async function editSentDates(invoiceId) {
         }
     } catch (e) {
         console.error('Error updating sent dates:', e);
-        alert('Network error updating sent dates.');
+        alert('Network error.');
     }
 }
 // ============================================================
@@ -641,5 +672,5 @@ async function editSentDates(invoiceId) {
 
 window.invoiceView = {
     viewPDF, viewHTML, syncFromQBO, resetQbo, markPaid, setEmailStatus, edit, remove,
-    loadInvoices, renderInvoiceView, setStatus, checkStripePayment, editSentDates 
+    loadInvoices, renderInvoiceView, setStatus, checkStripePayment, editSentDates ,_addSentDateRow, _saveSentDates
 };
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