WPF DisplayMemberBinding

<Window x:Class="WpfApplication3.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    Title="Window1" Height="189" Width="459">
    <ListView>
        <ListView.View>
            <GridView>
                <GridViewColumn Width="120" Header="Date" />
                <GridViewColumn Width="120" Header="Day Of Week" DisplayMemberBinding="{Binding DayOfWeek}" />
                <GridViewColumn Width="120" Header="Year" DisplayMemberBinding="{Binding Year}" />
            </GridView>
        </ListView.View>
        <sys:DateTime>2001,1,1</sys:DateTime>
        <sys:DateTime>2010,1,1</sys:DateTime>
        <sys:DateTime>7/8/9</sys:DateTime>
        <sys:DateTime>10/11/12</sys:DateTime>
    </ListView>
</Window>

Date のところは、DisplayMemberBinding していないけど、表示されている・・・