C1Chart控件显示时间错误

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前台绑定：
<c1:C1Chart
                  x:Name="chart"
                  HorizontalAlignment="Stretch"
                  VerticalAlignment="Stretch"
                  Data="{Binding ChartData}"
                  ChartType="LineSymbols" >
                  <c1:C1ChartLegend/>
                  <c1:C1Chart.View>
                     <c1:ChartView>
                        <c1:ChartView.Layers>
                              <c1:ChartPanel>
                                 <c1:ChartPanelObject
                                    Attach="DataXY"
                                    Action="MouseMove"
                                    DataPoint="-1,-1"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Top"
                                    Width="60" Height="50">
                                    <c1:ChartPanelObject.RenderTransform>
                                          <TranslateTransform Y="-50"/>
                                    </c1:ChartPanelObject.RenderTransform>
                                    <Grid DataContext="{Binding RelativeSource={x:Static RelativeSource.Self},Path=Parent}" Opacity="0.8">
                                          <Path Data="M0.5,0.5 L23,0.5 23,23 11.61165,29.286408 0.5,23 z" Stretch="Fill" Fill="#FFF1F1F1" Stroke="DarkGray" StrokeThickness="1"/>
                                          <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
                                             <TextBlock Text="{Binding DataPoint.X}" Margin="2 0"/>
                                             <TextBlock x:Name="label2" Text="{Binding DataPoint.Y}" FontWeight="Bold" Margin="2"/>
                                          </StackPanel>
                                    </Grid>
                                 </c1:ChartPanelObject>
                              </c1:ChartPanel>
                        </c1:ChartView.Layers>
                     </c1:ChartView>
                  </c1:C1Chart.View>
            </c1:C1Chart>

后台绑定：
XYDataSeries series = new XYDataSeries()
         {
            ValueBinding = new System.Windows.Data.Binding("Value"),
            XValueBinding = new System.Windows.Data.Binding("TimePoint"),
            Label = item,
         };
         return series;

数据源TimePoint为DateTime类型。
展示图片如下：

控件版本：