diff --git a/pos/services/inventory_engine.py b/pos/services/inventory_engine.py
index 26251b6..e9c1e5a 100644
--- a/pos/services/inventory_engine.py
+++ b/pos/services/inventory_engine.py
@@ -374,7 +374,7 @@ def get_movement_history(conn, inventory_id, limit=50):
         history.append({
             'id': r[0], 'type': r[1], 'quantity': r[2],
             'cost': float(r[3]) if r[3] else None,
-            'notes': r[4], 'date': str(r[5]),
+            'notes': r[4], 'date': r[5].isoformat() if r[5] else None,
             'employee': r[6], 'branch_id': r[7]
         })
     cur.close()
diff --git a/pos/static/js/inventory.js b/pos/static/js/inventory.js
index 9e397d2..f9862d7 100644
--- a/pos/static/js/inventory.js
+++ b/pos/static/js/inventory.js
@@ -46,6 +46,15 @@
         d.textContent = s;
         return d.innerHTML;
     }
+    function formatDateTime(isoStr) {
+        if (!isoStr) return '-';
+        var d = new Date(isoStr);
+        if (isNaN(d.getTime())) return esc(isoStr);
+        return d.toLocaleString('es-MX', {
+            day: '2-digit', month: '2-digit', year: 'numeric',
+            hour: '2-digit', minute: '2-digit'
+        });
+    }
 
     // --- Dashboard summary badges ---
     function loadSummary() {
@@ -1004,7 +1013,7 @@
                 history.forEach(function (h) {
                     var qtyColor = h.quantity > 0 ? 'var(--color-success)' : 'var(--color-error)';
                     html += '<tr>' +
-                        '<td style="font-size:var(--text-caption);">' + esc(h.date) + '</td>' +
+                        '<td style="font-size:var(--text-caption);">' + formatDateTime(h.date) + '</td>' +
                         '<td>' + esc(h.type) + '</td>' +
                         '<td style="color:' + qtyColor + ';font-weight:600;">' + (h.quantity > 0 ? '+' : '') + h.quantity + '</td>' +
                         '<td class="td--amount">' + (h.cost ? '$' + fmt(h.cost) : '—') + '</td>' +
@@ -1828,7 +1837,7 @@
                 history.forEach(function (h) {
                     var qtyColor = h.quantity > 0 ? 'var(--color-success)' : 'var(--color-error)';
                     html += '<tr>' +
-                        '<td style="font-size:var(--text-caption);">' + esc(h.date) + '</td>' +
+                        '<td style="font-size:var(--text-caption);">' + formatDateTime(h.date) + '</td>' +
                         '<td>' + esc(h.type) + '</td>' +
                         '<td style="color:' + qtyColor + ';font-weight:600;">' + (h.quantity > 0 ? '+' : '') + h.quantity + '</td>' +
                         '<td class="td--amount">' + (h.cost ? '$' + fmt(h.cost) : '\u2014') + '</td>' +
diff --git a/pos/static/pwa/sw.js b/pos/static/pwa/sw.js
index 98cd6bd..1632e25 100644
--- a/pos/static/pwa/sw.js
+++ b/pos/static/pwa/sw.js
@@ -6,7 +6,7 @@
 // The fetch handler normalizes static asset URLs (strips ?v= query strings)
 // so templates can use cache-busting query params freely.
 
-const CACHE_NAME = 'nexus-pos-v20';
+const CACHE_NAME = 'nexus-pos-v21';
 
 const APP_SHELL = [
   '/pos/static/css/tokens.css',
diff --git a/pos/templates/inventory.html b/pos/templates/inventory.html
index 5a23c89..0f2c96a 100644
--- a/pos/templates/inventory.html
+++ b/pos/templates/inventory.html
@@ -1059,7 +1059,7 @@
   <script src="/pos/static/js/pos-utils.js?v=2" defer></script>
   <script src="/pos/static/js/sidebar.js" defer></script>
   <script src="/pos/static/js/virtual-scroll.js?v=2" defer></script>
-  <script src="/pos/static/js/inventory.js?v=18" defer></script>
+  <script src="/pos/static/js/inventory.js?v=19" defer></script>
   <script src="/pos/static/js/offline-banner.js" defer></script>
   <script src="/pos/static/js/sync-engine.js" defer></script>
   <script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>