<!--必要に応じてWindow.Resources等に変更してください-->
<UserControl.Resources>
　<local:JapaneseCalendarConverter x:Key="jpConverter" />
</UserControl.Resources>

<Grid Loaded="Grid_Loaded">
　<c1:C1DataGrid AutoGenerateColumns="False" Name="C1DataGrid1">
　　<c1:C1DataGrid.Columns>
　　　<c1:DataGridTextColumn Header="名前" Binding="{Binding Name}"/>
　　　　<c1:DataGridTextColumn Header="住所" Binding="{Binding Address}"/>
　　　　<c1:DataGridDateTimeColumn Header="入社日付" Binding="{Binding i, Converter={StaticResource jpConverter}}" DateFormat="Long" />
　　　　<c1:DataGridTemplateColumn Header="入社日付（和暦入力）">
　　　　　<c1:DataGridTemplateColumn.CellTemplate>
　　　　　　<DataTemplate>
　　　　　　　<TextBlock Text="{Binding i, Converter={StaticResource jpConverter}}" HorizontalAlignment="Center" VerticalAlignment="Center" />
　　　　　　</DataTemplate>
　　　　　</c1:DataGridTemplateColumn.CellTemplate>
　　　　<c1:DataGridTemplateColumn.CellEditingTemplate>
　　　　　<DataTemplate>
　　　　　　<c1:C1DatePicker SelectedDate="{Binding i}" CustomFormat="ggy年MM月dd日" />
　　　　　</DataTemplate>
　　　　</c1:DataGridTemplateColumn.CellEditingTemplate>
　　　</c1:DataGridTemplateColumn>
　　</c1:C1DataGrid.Columns>
　</c1:C1DataGrid>
</Grid>

Partial Public Class KB81011
　Inherits UserControl
　Public Sub New()
　　Dim jpCulture As Globalization.CultureInfo = New Globalization.CultureInfo("ja-JP", True)
　　jpCulture.DateTimeFormat.Calendar = New Globalization.JapaneseCalendar()
　　jpCulture.DateTimeFormat.LongDatePattern = "ggyy年M月d日"
　　System.Threading.Thread.CurrentThread.CurrentCulture = jpCulture
　　Me.Language = Markup.XmlLanguage.GetLanguage(Globalization.CultureInfo.CurrentCulture.Name)

　　InitializeComponent()

　End Sub

　Private person As Collections.ObjectModel.ObservableCollection(Of Person)

　Private Sub Grid_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
　　person = New Collections.ObjectModel.ObservableCollection(Of Person)() From
　　{
　　　New Person() With {.Name = "佐藤", .Address = "宮城", .i = New DateTime(2014, 2, 22)},
　　　New Person() With {.Name = "木村", .Address = "東京", .i = New DateTime(2014, 9, 11)},
　　　New Person() With {.Name = "高橋", .Address = "大阪", .i = New DateTime(2014, 9, 26)},
　　　New Person() With {.Name = "斎藤", .Address = "福岡", .i = New DateTime(2014, 6, 12)}
　　}
　　C1DataGrid1.ItemsSource = person
　End Sub
End Class

Public Class Person
　Public Property Name() As String
　　Get
　　　Return m_Name
　　End Get
　　Set(ByVal value As String)
　　　m_Name = value
　　End Set
　End Property
　Private m_Name As String
　Public Property Address() As String
　　Get
　　　Return m_Address
　　End Get
　　Set(ByVal value As String)
　　　m_Address = value
　　End Set
　End Property
　Private m_Address As String
　Public Property i() As DateTime
　　Get
　　　Return i_
　　End Get
　　Set(ByVal value As DateTime)
　　　i_ = value
　　End Set
　End Property
　Private i_ As DateTime
End Class

Public Class JapaneseCalendarConverter
　Implements Windows.Data.IValueConverter

　Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements Windows.Data.IValueConverter.Convert
　　Return CType(value, DateTime).ToString("ggyy年M月d日")
　End Function

　Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements Windows.Data.IValueConverter.ConvertBack
　　Return value
　　End Function
End Class

public partial class KB81011 : UserControl
{
　public KB81011()
　{
　　CultureInfo jpCulture = new CultureInfo("ja-JP", true);
　　jpCulture.DateTimeFormat.Calendar = new JapaneseCalendar();
　　jpCulture.DateTimeFormat.LongDatePattern = "ggyy年M月d日";
　　Thread.CurrentThread.CurrentCulture = jpCulture;
　　this.Language = XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.Name);
　　InitializeComponent();
　}

　private ObservableCollection person;

　void Grid_Loaded(object sender, System.Windows.RoutedEventArgs e)
　{
　　person = new ObservableCollection(){
　　　new Person() {Name = "佐藤", Address="宮城", i = new DateTime(2014,2,22)},
　　　new Person() {Name = "木村", Address="東京", i = new DateTime(2014,9,11)},
　　　new Person() {Name = "高橋", Address="大阪", i = new DateTime(2014,9,26)},
　　　new Person() {Name = "斎藤", Address="福岡", i = new DateTime(2014,6,12)},
　　};
　　C1DataGrid1.ItemsSource = person;　　　　　
　}
}

public class Person
{
　public string Name {
　　get { return m_Name; }
　　set { m_Name = value; }
　}
　private string m_Name;
　public string Address {
　　get { return m_Address; }
　　set { m_Address = value; }
　}
　private string m_Address;
　public DateTime i {
　　get { return i_; }
　　set { i_ = value; }
　}
　private DateTime i_;
}

public class JapaneseCalendarConverter : System.Windows.Data.IValueConverter
{
　public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
　{
　　return ((System.DateTime)value).ToString("ggyy年M月d日");
　}
　public object ConvertBack(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
　{
　　return value;
　}
}