diff --git a/packages/devextreme/js/__internal/ui/date_box/m_date_box.mask.parts.ts b/packages/devextreme/js/__internal/ui/date_box/m_date_box.mask.parts.ts
index 7b0f21534d6a..f02403eab6ae 100644
--- a/packages/devextreme/js/__internal/ui/date_box/m_date_box.mask.parts.ts
+++ b/packages/devextreme/js/__internal/ui/date_box/m_date_box.mask.parts.ts
@@ -32,6 +32,7 @@ const PATTERN_GETTERS = {
   m: 'getMinutes',
   s: 'getSeconds',
   S: 'getMilliseconds',
+  x: 'getTimezoneOffset',
 };
 
 const PATTERN_SETTERS = extend({}, getPatternSetters(), {
@@ -79,6 +80,7 @@ const PATTERN_SETTERS = extend({}, getPatternSetters(), {
 
     date.setFullYear(newValue);
   },
+  x: (date) => date,
 });
 
 const getPatternGetter = (patternChar) => {
@@ -134,6 +136,7 @@ const getLimits = (pattern, date, forcedPattern) => {
     s: { min: 0, max: 59 },
     S: { min: 0, max: 999 },
     a: { min: 0, max: 1 },
+    x: { min: 0, max: 0 }, // NOTE: Timezone part is read only.
   };
   // @ts-expect-error
   return limits[forcedPattern || pattern] || limits.getAmPm;
diff --git a/packages/devextreme/js/localization/ldml/date.parser.js b/packages/devextreme/js/localization/ldml/date.parser.js
index 199685d749d3..b9ad3b6f3ca7 100644
--- a/packages/devextreme/js/localization/ldml/date.parser.js
+++ b/packages/devextreme/js/localization/ldml/date.parser.js
@@ -62,6 +62,9 @@ const PATTERN_REGEXPS = {
     },
     w: function(count) {
         return count === 2 ? '[1-5][0-9]|0?[0-9]' : '0??[0-9]|[1-5][0-9]';
+    },
+    x: function(count) {
+        return count === 3 ? '[+-](?:2[0-3]|[01][0-9]):(?:[0-5][0-9])|Z' : '[+-](?:2[0-3]|[01][0-9])(?:[0-5][0-9])|Z';
     }
 };
 
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
index a0ffea2d6a74..9b1e917aa3b1 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.editors/datebox.mask.tests.js
@@ -1266,6 +1266,40 @@ module('Date AM/PM Handling', setupModule, () => {
     });
 });
 
+module('TimeZone Handling', setupModule, () => {
+    test('should support \'x\' in date pattern and not generate errors (T1241387)', function(assert) {
+        try {
+            this.instance.option({
+                displayFormat: 'yyyy-MM-dd\'T\'HH:mm:ssxxx',
+                useMaskBehavior: true,
+                type: 'date',
+            });
+            assert.ok(true, 'no error shown');
+        } catch(e) {
+            assert.ok(false, 'error exists');
+        }
+    });
+
+    test('should not show error when changing timezone on runtime via up/down buttons (T1241387)', function(assert) {
+        try {
+            this.instance.option({
+                displayFormat: 'yyyy-MM-dd\'T\'HH:mm:ssxxx',
+                useMaskBehavior: true,
+                type: 'date',
+            });
+            const oldValue = this.$input.val();
+            this.keyboard.caret({ start: 20, end: 24 });
+            this.$input.focus().trigger('dxclick');
+            this.keyboard.press('up');
+
+            assert.ok(true, 'no error shown');
+            assert.strictEqual(this.$input.val(), oldValue, 'value has not been modified');
+        } catch(e) {
+            assert.ok(false, 'error exists');
+        }
+    });
+});
+
 module('Empty dateBox', {
     beforeEach: function() {
         setupModule.beforeEach.call(this);