diff --git a/app/modules/loyalty/static/shared/js/loyalty-card-detail-view.js b/app/modules/loyalty/static/shared/js/loyalty-card-detail-view.js
index 2b8b541c..941162a9 100644
--- a/app/modules/loyalty/static/shared/js/loyalty-card-detail-view.js
+++ b/app/modules/loyalty/static/shared/js/loyalty-card-detail-view.js
@@ -177,13 +177,13 @@ function loyaltyCardDetailView(config) {
 
         // Formatting helpers
         formatNumber(num) {
-            return num == null ? '0' : new Intl.NumberFormat('en-US').format(num);
+            return num == null ? '0' : new Intl.NumberFormat(I18n.locale).format(num);
         },
 
         formatDate(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
@@ -196,7 +196,7 @@ function loyaltyCardDetailView(config) {
         formatDateTime(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleString('en-US', {
+                return new Date(dateString).toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/loyalty/static/shared/js/loyalty-cards-list.js b/app/modules/loyalty/static/shared/js/loyalty-cards-list.js
index 8454a9c2..c6bf19fb 100644
--- a/app/modules/loyalty/static/shared/js/loyalty-cards-list.js
+++ b/app/modules/loyalty/static/shared/js/loyalty-cards-list.js
@@ -223,13 +223,13 @@ function loyaltyCardsList(config) {
 
         // Formatting helpers
         formatNumber(num) {
-            return num == null ? '0' : new Intl.NumberFormat('en-US').format(num);
+            return num == null ? '0' : new Intl.NumberFormat(I18n.locale).format(num);
         },
 
         formatDate(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
diff --git a/app/modules/loyalty/static/shared/js/loyalty-devices-list.js b/app/modules/loyalty/static/shared/js/loyalty-devices-list.js
index 2c331ba0..765f7ee6 100644
--- a/app/modules/loyalty/static/shared/js/loyalty-devices-list.js
+++ b/app/modules/loyalty/static/shared/js/loyalty-devices-list.js
@@ -110,7 +110,7 @@ function loyaltyDevicesList(config) {
         formatDate(value) {
             if (!value) return '-';
             try {
-                return new Date(value).toLocaleString();
+                return new Date(value).toLocaleString(I18n.locale);
             } catch (e) {
                 return value;
             }
diff --git a/app/modules/loyalty/static/shared/js/loyalty-pins-list.js b/app/modules/loyalty/static/shared/js/loyalty-pins-list.js
index 585d8bab..f644fada 100644
--- a/app/modules/loyalty/static/shared/js/loyalty-pins-list.js
+++ b/app/modules/loyalty/static/shared/js/loyalty-pins-list.js
@@ -317,7 +317,7 @@ function loyaltyPinsList(config) {
         formatDate(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
@@ -330,7 +330,7 @@ function loyaltyPinsList(config) {
         formatDateTime(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/app/modules/loyalty/static/shared/js/loyalty-transactions-list.js b/app/modules/loyalty/static/shared/js/loyalty-transactions-list.js
index c3a83d03..74fac64a 100644
--- a/app/modules/loyalty/static/shared/js/loyalty-transactions-list.js
+++ b/app/modules/loyalty/static/shared/js/loyalty-transactions-list.js
@@ -209,13 +209,13 @@ function loyaltyTransactionsList(config) {
 
         // Formatting helpers
         formatNumber(num) {
-            return num == null ? '0' : new Intl.NumberFormat('en-US').format(num);
+            return num == null ? '0' : new Intl.NumberFormat(I18n.locale).format(num);
         },
 
         formatDate(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleDateString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric'
@@ -228,7 +228,7 @@ function loyaltyTransactionsList(config) {
         formatDateTime(dateString) {
             if (!dateString) return 'Never';
             try {
-                return new Date(dateString).toLocaleDateString('en-US', {
+                return new Date(dateString).toLocaleString(I18n.locale, {
                     year: 'numeric',
                     month: 'short',
                     day: 'numeric',
diff --git a/static/shared/js/i18n.js b/static/shared/js/i18n.js
index ff8ae793..21437459 100644
--- a/static/shared/js/i18n.js
+++ b/static/shared/js/i18n.js
@@ -170,6 +170,16 @@ const I18n = {
         }
     },
 
+    /**
+     * BCP-47 locale tag for the current dashboard language.
+     * Use as the first arg to Intl.* / toLocale* APIs so dates and numbers
+     * render in the user's language instead of the browser default.
+     * Falls back to 'en' (which is what the dashboards default to).
+     */
+    get locale() {
+        return this._language || 'en';
+    },
+
     /**
      * Notify Alpine (and other listeners) that translations are ready.
      * Bumps the Alpine store version so reactive $t() bindings re-evaluate.