diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/DateTimePickerLocalizationTests.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/DateTimePickerLocalizationTests.cs
new file mode 100644
index 00000000000..1e4d2feef0c
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/DateTimePickerLocalizationTests.cs
@@ -0,0 +1,393 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.Forms.Core.UITests;
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+#if UITEST
+    [Category(UITestCategories.DatePicker)]
+#endif
+    [Preserve(AllMembers = true)]
+    [Issue(IssueTracker.None, 88888888, "DateTime Localization Issue",
+        PlatformAffected.iOS | PlatformAffected.Android)]
+    public class DateTimeLocalizationTests : TestNavigationPage
+    {
+        protected override void Init()
+        {
+#if APP
+			PushAsync(new GalleryPages.DateTimePickerGalleries.DateTimePickerGallery());
+#endif
+        }
+
+#if UITEST
+        // TimePicker Format String: H, m, s, t
+        // TimePicker Time: 12 AM, 0 minute
+        // Separator: ".", " "
+        [Test]
+        public void TimePicker24HMidnight()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "H.m.s t");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "0, 0");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("0.0.0 A", text);
+        }
+
+        // TimePicker Format String: hh, m, tt
+        // TimePicker Time: 12 AM, 0 minute
+        // Separator: "/", " "
+        [Test]
+        public void TimePicker12HMidnight()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "hh m/tt");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "0, 0");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("12 0/AM", text);
+        }
+
+        // TimePicker Format String: HH, mm, tt
+        // TimePicker Time: 1-11 PM, 1-58 minute (1)
+        // Separator: ":", " "
+        [Test]
+        public void TimePicker24HAfternoon()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "HH:mm tt");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "13, 5");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("13:05 PM", text);
+        }
+
+        // TimePicker Format String: h, ss
+        // TimePicker Time: 1-11 PM, 59 minute (11)
+        // Separator: "-"
+        [Test]
+        public void TimePicker12HAfternoon()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "h-ss");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "23, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("11-00", text);
+        }
+
+        // TimePicker Format String: hh
+        // TimePicker Time: 12 PM, 1-58 minute
+        // Separator: none
+        [Test]
+        public void TimePicker12HNoon()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "hh");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "12, 37");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("12", text);
+        }
+
+        // TimePicker Format String: HH, tt
+        // TimePicker Time: 12 PM, 0 minute
+        // Separator: " "
+        [Test]
+        public void TimePicker24HNoon()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "HH tt");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "12, 0");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("12 PM", text);
+        }
+
+        // TimePicker Format String: hh, mm
+        // TimePicker Time: 1-11 AM, 59 minute
+        // Separator: ":"
+        [Test]
+        public void TimePicker12HMorning()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "hh:mm");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "7, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("07:59", text);
+        }
+
+        // TimePicker Format String: H
+        // TimePicker Time: 1-11 AM, 1-58 minute
+        // Separator: "."
+        [Test]
+        public void TimePicker24HMorning()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "H.");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "5, 1");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("5.", text);
+        }
+
+        // TimePicker Format String: mm t
+        // TimePicker Time: 1 PM, 59 minute
+        // Separator: ","
+        [Test]
+        public void TimePickerNoHour()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "mm, t");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "13, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("59, P", text);
+        }
+
+        // TimePicker Format String: first half of uppercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void TimePickerRandomUppercaseBegin()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "ABCDEGIJLNOP");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "23, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("ABCDEGIJLNOP", text);
+        }
+
+        // TimePicker Format String: latter half of uppercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void TimePickerRandomUppercaseEnd()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "QRSTUVWXYZ");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "23, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("QRSTUVWXYZ", text);
+        }
+
+        // TimePicker Format String: other lowercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void TimePickerRandomLowercaseLetters()
+        {
+            RunningApp.Tap(x => x.Marked("TimePicker"));
+            RunningApp.ClearText("timeFormatString");
+            RunningApp.EnterText("timeFormatString", "abceijklnopqruvwx");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingTime");
+            RunningApp.EnterText("settingTime", "23, 59");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("timeClockOptions")[0].Text;
+            Assert.AreEqual("abceijklnopqruvwx", text);
+        }
+
+        // DatePicker Format String: d, M, y
+        // Separator: "/"
+        [Test]
+        public void DatePickerOneDigit()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "d/M/y");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "1999, 1, 31");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("31/1/99", text);
+        }
+
+        // DatePicker Format String: dd, MM, yy
+        // Separator: "-"
+        [Test]
+        public void DatePickerTwoDigit()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "MM-dd-yy");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2000, 2, 29");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("02-29-00", text);
+        }
+
+        // DatePicker Format String: ddd, MMM, yyy
+        // Separator: ","
+        [Test]
+        public void DatePickerThreeDigit()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "yyy, MMM, ddd");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2010, 4, 15");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("2010, Apr, Thu", text);
+        }
+
+        // DatePicker Format String: dddd, MMMM, yyyy
+        // Separator: "."
+        [Test]
+        public void DatePickerFourDigit()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "MMMM.dddd.yyyy");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2015, 8, 1");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("August.Saturday.2015", text);
+        }
+
+        // DatePicker Format String: MMMM, yy
+        // Separator: " "
+        [Test]
+        public void DatePickerNoDay()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "MMMM yy");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "1997, 10, 30");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("October 97", text);
+        }
+
+        // DatePicker Format String: dddd
+        // Separator: none
+        [Test]
+        public void DatePickerDay()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "dddd");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2020, 7, 20");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("Monday", text);
+        }
+
+        // DatePicker Format String: MMM, yyyy
+        // Separator: " "
+        [Test]
+        public void DatePickerColon()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "yyyy: MMM");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2002, 12, 31");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("2002: Dec", text);
+        }
+
+        // TimePicker Format String: first half of uppercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void DatePickerRandomUppercaseBegin()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "ABCDEGIJLNOP");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2002, 12, 31");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("ABCDEGIJLNOP", text);
+        }
+
+        // TimePicker Format String: latter half of uppercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void DatePickerRandomUppercaseEnd()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "QRSTUVWXYZ");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2002, 12, 31");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("QRSTUVWXYZ", text);
+        }
+
+        // TimePicker Format String: other lowercase letters
+        // TimePicker Time: 11 PM, 59 minute
+        [Test]
+        public void DatePickerRandomLowercaseLetters()
+        {
+            RunningApp.Tap(x => x.Marked("DatePicker"));
+            RunningApp.ClearText("dateFormatString");
+            RunningApp.EnterText("dateFormatString", "abceijklnopqruvwx");
+            RunningApp.PressEnter();
+            RunningApp.ClearText("settingDate");
+            RunningApp.EnterText("settingDate", "2002, 12, 31");
+            RunningApp.PressEnter();
+            var text = RunningApp.WaitForElement("dateCalendarOptions")[0].Text;
+            Assert.AreEqual("abceijklnopqruvwx", text);
+        }
+#endif
+    }
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
index 1fa3990b7be..d25ec881cc8 100644
--- a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
@@ -1454,6 +1454,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue11291.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue11244.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue11272.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)DateTimePickerLocalizationTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Bugzilla22229.xaml">