Fixed date formatter issue with different timezone (#13634) fixes #13366

Author: jsuarezruiz

Xamarin.Forms.Platform.iOS/Renderers/DatePickerRenderer.cs

@@ -168,10 +168,12 @@ void UpdateDateFromModel(bool animate)
 			if (_picker.Date.ToDateTime().Date != Element.Date.Date)
 				_picker.SetDate(Element.Date.ToNSDate(), animate);
 
-			//can't use Element.Format because it won't display the correct format if the region and language are set differently
-			if (String.IsNullOrWhiteSpace(Element.Format) || Element.Format.Equals("d") || Element.Format.Equals("D"))
+			// Can't use Element.Format because it won't display the correct format if the region and language are set differently
+			if (string.IsNullOrWhiteSpace(Element.Format) || Element.Format.Equals("d") || Element.Format.Equals("D"))
 			{
 				NSDateFormatter dateFormatter = new NSDateFormatter();
+				dateFormatter.TimeZone = NSTimeZone.FromGMT(0);
+
 				if (Element.Format?.Equals("D") == true)
 				{
 					dateFormatter.DateStyle = NSDateFormatterStyle.Long;