ES-975464 - Provided codes for UWP

Author: SreemonPremkumarM

README.md

@@ -6,6 +6,7 @@ You can create your own column by overriding the [predefined column types](https
 
 In the below code snippet, converter created to format the **DateTimeOffSet** value to DateTime by defining **ValueBinding** (edit) and **DisplayBinding** (non-edit).
 
+### For WPF:
 ``` c#
 public class DateTimeOffsetFormatConverter : IValueConverter
 {
@@ -119,7 +120,7 @@ public class GridDateTimeOffsetColumn : GridDateTimeColumn
 
 In the below code snippet, created **GridDateTimeOffsetColumn** added to [SfDataGrid.Columns](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.Grid.SfDataGrid.html#Syncfusion_UI_Xaml_Grid_SfDataGrid_Columns) collection and specify the Pattern as FullDateTime. Since the **ShortDate** is the default pattern of **GridDateTimeColumn**.
 
-### XAML
+#### XAML
 
 ``` xml
 <syncfusion:SfDataGrid  x:Name="dataGrid"                                                                       
@@ -131,7 +132,7 @@ In the below code snippet, created **GridDateTimeOffsetColumn** added to [SfData
 </syncfusion:SfDataGrid>
 ```
 
-### C#
+#### C#
 
 ``` c#
 this.datagrid1.Columns.Add(new GridDateTimeOffsetColumn()
@@ -141,3 +142,108 @@ this.datagrid1.Columns.Add(new GridDateTimeOffsetColumn()
     UseBindingValue = true
 });
 ```
+
+### For UWP:
+
+``` csharp
+public class DateTimeOffsetFormatConverter : IValueConverter
+{
+    private GridDateTimeOffsetColumn cachedColumn;
+
+    public DateTimeOffsetFormatConverter(GridDateTimeOffsetColumn column)
+    {
+        cachedColumn = column;
+    }
+
+    object IValueConverter.Convert(object value, Type targetType, object parameter, string language)
+    {
+        value = ((DateTimeOffset)value).DateTime;
+        var column = cachedColumn as GridDateTimeColumn;
+
+        if (value == null || DBNull.Value == value)
+        {
+            if (column.AllowNullValue && column.MaxDate != System.DateTime.MaxValue && column.WaterMark == string.Empty)
+                return column.MaxDate;
+               
+            if (column.AllowNullValue && column.WaterMark != string.Empty)
+                return column.WaterMark;
+
+            if (column.MaxDate != System.DateTime.MaxValue)
+                return column.MaxDate;
+        }
+
+        DateTime _columnValue;
+        _columnValue = (DateTime)value;
+
+        if (_columnValue < column.MinDate)
+            _columnValue = column.MinDate;
+
+        if (_columnValue > column.MaxDate)
+            _columnValue = column.MaxDate;
+
+        return _columnValue.ToString(column.FormatString, CultureInfo.CurrentUICulture);
+    }
+      
+    object IValueConverter.ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}
+
+public class DateTimeOffsetToDateTimeConverter : IValueConverter
+{
+    object IValueConverter.Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value == null)
+            return null;
+        return ((DateTimeOffset)value).DateTime;
+    }
+
+    object IValueConverter.ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        if (value == null)
+            return null;
+        return value is DateTimeOffset ? value : new DateTimeOffset((DateTime)value);
+    }
+}
+```
+
+In the below code snippet, **GridDateTimeOffsetColumn** column created from **GridDateTimeColumn**.
+
+``` csharp
+public class GridDateTimeOffsetColumn:GridDateTimeColumn
+{
+    protected override void SetDisplayBindingConverter()
+    {
+        if ((DisplayBinding as Binding).Converter == null)
+            (DisplayBinding as Binding).Converter = new DateTimeOffsetFormatConverter(this);
+
+        if ((ValueBinding as Binding).Converter == null)
+            (ValueBinding as Binding).Converter = new DateTimeOffsetToDateTimeConverter();
+    }
+}
+```
+
+In the below code snippet, created **GridDateTimeOffsetColumn** added to **SfDataGrid.Columns** collection and specify the full date-time pattern in **FormatString** as **F**. Since the **ShortDate** is the default pattern of **GridDateTimeColumn**.
+
+#### XAML
+
+``` xml
+<syncfusion:SfDataGrid x:Name="dataGrid"
+                       AutoGenerateColumns="False"
+                       ItemsSource="{Binding Orders}">
+    <syncfusion:SfDataGrid.Columns>
+        <local:GridDateTimeOffsetColumn FormatString="F"
+                                        HeaderText="Order Date"
+                                        MappingName="OrderDate" 
+                                        AllowInlineEditing="True"
+                                        UseBindingValue="True"/>
+    </syncfusion:SfDataGrid.Columns>
+</syncfusion:SfDataGrid>
+```
+
+#### C#
+
+``` csharp
+this.dataGrid.Columns.Add(new GridDateTimeOffsetColumn() { HeaderText = "Order Date", MappingName = "OrderDate", FormatString = "F" , AllowInlineEditing = true, UseBindingValue = true });
+```