Fixed https://github.com/HandyOrg/HandyControl/issues/1065

src/Shared/HandyControl_Shared/Controls/Input/DateTimePicker.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Threading;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
@@ -82,7 +81,6 @@ namespace HandyControl.Controls
 
         public DateTimePicker()
         {
-            Thread.CurrentThread.CurrentCulture = System.Globalization.CultureInfo.InvariantCulture;
             InitCalendarWithClock();
             CommandBindings.Add(new CommandBinding(ControlCommands.Clear, (s, e) =>
             {