diff --git a/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/agenda.tests.js b/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/agenda.tests.js
index 4b5c589f2e93..5fcc8fead398 100644
--- a/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/agenda.tests.js
+++ b/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/agenda.tests.js
@@ -4,12 +4,13 @@ var $ = require("jquery"),
     devices = require("core/devices"),
     resizeCallbacks = require("core/utils/window").resizeCallbacks,
     fx = require("animation/fx"),
-    Color = require("color");
+    Color = require("color"),
+    subscribes = require("ui/scheduler/ui.scheduler.subscribes");
 
 require("ui/scheduler/ui.scheduler");
 
 function getDeltaTz(schedulerTz) {
-    var defaultTz = new Date().getTimezoneOffset() * 60000;
+    var defaultTz = -10800000;
     return schedulerTz * 3600000 + defaultTz;
 }
 
@@ -1025,26 +1026,31 @@ QUnit.test("The timeZone option should be processed correctly", function(assert)
 });
 
 QUnit.test("All-day appointment should not be duplicated with custom timezone", function(assert) {
-    this.clock.restore();
-    var timezoneDifference = getDeltaTz(5),
-        getDate = function(date) {
-            return new Date(date.getTime() - timezoneDifference);
-        };
-
-    this.createInstance({
-        views: ["agenda"],
-        currentView: "agenda",
-        currentDate: new Date(2016, 4, 3),
-        timeZone: "Asia/Ashkhabad",
-        dataSource: [{
-            startDate: getDate(new Date(2016, 4, 4)),
-            endDate: getDate(new Date(2016, 4, 5))
-        }]
-    });
+    var tzOffsetStub = sinon.stub(subscribes, "getClientTimezoneOffset").returns(-10800000);
+    try {
+        this.clock.restore();
+        var timezoneDifference = getDeltaTz(5),
+            getDate = function(date) {
+                return new Date(date.getTime() - timezoneDifference);
+            };
+
+        this.createInstance({
+            views: ["agenda"],
+            currentView: "agenda",
+            currentDate: new Date(2016, 4, 3),
+            timeZone: "Asia/Ashkhabad",
+            dataSource: [{
+                startDate: getDate(new Date(2016, 4, 4)),
+                endDate: getDate(new Date(2016, 4, 5))
+            }]
+        });
 
-    var $appts = this.instance.element().find(".dx-scheduler-appointment");
+        var $appts = this.instance.element().find(".dx-scheduler-appointment");
 
-    assert.equal($appts.length, 1, "Appt count is OK");
+        assert.equal($appts.length, 1, "Appt count is OK");
+    } finally {
+        tzOffsetStub.restore();
+    }
 });
 
 QUnit.test("All-day appointment should not be duplicated with custom timezone (T437288)", function(assert) {
diff --git a/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/appointments.tests.js b/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/appointments.tests.js
index 7df054972063..774709503502 100644
--- a/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/appointments.tests.js
+++ b/testing/tests/DevExpress.ui.widgets.scheduler/integrationParts/appointments.tests.js
@@ -4126,27 +4126,32 @@ QUnit.test("Long multiday appointment should have right position on timeline wee
 });
 
 QUnit.test("Appointment should have right width in workspace with timezone", function(assert) {
-    this.clock.restore();
-    this.createInstance({
-        dataSource: [],
-        currentDate: new Date(2016, 4, 1),
-        currentView: "month",
-        firstDayOfWeek: 1,
-        startDayHour: 3,
-        endDayHour: 24,
-        timeZone: "Asia/Ashkhabad"
-    });
+    var tzOffsetStub = sinon.stub(subscribes, "getClientTimezoneOffset").returns(-10800000);
+    try {
+        this.clock.restore();
+        this.createInstance({
+            dataSource: [],
+            currentDate: new Date(2017, 4, 1),
+            currentView: "month",
+            firstDayOfWeek: 1,
+            startDayHour: 3,
+            endDayHour: 24,
+            timeZone: "Asia/Ashkhabad"
+        });
 
-    this.instance.addAppointment({
-        text: "Task 1",
-        startDate: new Date(2016, 4, 4),
-        endDate: new Date(2016, 4, 5)
-    });
+        this.instance.addAppointment({
+            text: "Task 1",
+            startDate: new Date(2017, 4, 4),
+            endDate: new Date(2017, 4, 5)
+        });
 
-    var $appointment = this.instance.element().find(".dx-scheduler-work-space .dx-scheduler-appointment").eq(0),
-        $cell = this.instance.element().find(".dx-scheduler-work-space .dx-scheduler-date-table-cell").eq(9);
+        var $appointment = this.instance.element().find(".dx-scheduler-work-space .dx-scheduler-appointment").eq(0),
+            $cell = this.instance.element().find(".dx-scheduler-work-space .dx-scheduler-date-table-cell").eq(9);
 
-    assert.roughEqual($appointment.outerWidth(), $cell.outerWidth(), 1.001, "Task has a right width");
+        assert.roughEqual($appointment.outerWidth(), $cell.outerWidth(), 1.001, "Task has a right width");
+    } finally {
+        tzOffsetStub.restore();
+    }
 });
 
 QUnit.test("Appointment with zero-duration should be rendered correctly(T443143)", function(assert) {
diff --git a/testing/tests/DevExpress.ui.widgets.scheduler/subscribes.tests.js b/testing/tests/DevExpress.ui.widgets.scheduler/subscribes.tests.js
index b7df26b1e527..4aa875e6ef4e 100644
--- a/testing/tests/DevExpress.ui.widgets.scheduler/subscribes.tests.js
+++ b/testing/tests/DevExpress.ui.widgets.scheduler/subscribes.tests.js
@@ -11,10 +11,6 @@ var $ = require("jquery"),
     dateUtils = require("core/utils/date"),
     config = require("core/config");
 
-function getDaylightSavingsOffset(date1, date2) {
-    return date1.getTimezoneOffset() - date2.getTimezoneOffset();
-}
-
 QUnit.testStart(function() {
     $("#qunit-fixture").html('<div id="scheduler"></div>');
 });
@@ -701,8 +697,6 @@ QUnit.test("'convertDateByTimezone' should return date according to the custom t
     var date = new Date(2015, 6, 3, 3),
         timezoneDifference = date.getTimezoneOffset() * 60000 + timezoneValue * 3600000;
 
-    timezoneDifference -= getDaylightSavingsOffset(date, new Date()) * 60000;
-
     var convertedDate = this.instance.fire("convertDateByTimezone", date);
 
     assert.deepEqual(convertedDate, new Date(date.getTime() + timezoneDifference), "'convertDateByTimezone' works fine");
@@ -720,8 +714,6 @@ QUnit.test("'convertDateByTimezone' should return date according to the custom t
     var date = new Date(2015, 6, 3, 3),
         timezoneDifference = date.getTimezoneOffset() * 60000 + timezone.value * 3600000;
 
-    timezoneDifference -= getDaylightSavingsOffset(date, new Date()) * 60000;
-
     var convertedDate = this.instance.fire("convertDateByTimezone", date);
 
     assert.deepEqual(convertedDate, new Date(date.getTime() + timezoneDifference), "'convertDateByTimezone' works fine");