Microsoft Point chart time format not set Properly.

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MSChart

I am using Microsoft chart. in my chart I want Date and time wise point but date coming properly but time is not display properly.

IQueryable<Agile.HelpDesk.Core.Entities.Incident> incidents = new IncidentManager().GetIncidentsByDate(startDate, endDate);
            Chart1.Series["Series1"].Points.Clear();
            Chart1.Series["Series2"].Points.Clear();
            TimeSpan tsStart = new TimeSpan(07, 00, 00);
            TimeSpan tsEnd = new TimeSpan(17, 00, 00);
            foreach (Agile.HelpDesk.Core.Entities.Incident item in incidents)
            {
                if (item.OpenDate.TimeOfDay >= tsStart && item.OpenDate.TimeOfDay <= tsEnd)
                {
                    Chart1.Series["Series1"].XValueType = ChartValueType.Time;
                    Chart1.Series["Series1"].Points.AddXY(item.OpenDate.ToString("HH:mm"), item.OpenDate);
                    Chart1.Series["Series1"].Points[Chart1.Series["Series1"].Points.Count - 1].ToolTip = "Id : " + item.ID.ToString() + ", Open Date : " + item.OpenDate;

                    //Chart1.Series["Series1"].YValueType = ChartValueType.Date;
                }
                else
                {
                    Chart1.Series["Series2"].XValueType = ChartValueType.Time;
                    Chart1.Series["Series2"].Points.AddXY(item.OpenDate.ToString("HH:mm"), item.OpenDate);
                    Chart1.Series["Series2"].Points[Chart1.Series["Series2"].Points.Count - 1].ToolTip = "Id : " + item.ID.ToString() + ", Open Date : " + item.OpenDate;

                    //Chart1.Series["Series2"].YValueType = ChartValueType.Date;
                }
            }

            Chart1.ChartAreas["ChartArea1"].AxisX.LabelStyle.Format = "HH:mm";

            Chart1.ChartAreas["ChartArea1"].AxisY.MajorGrid.LineColor = Color.Blue;

            Chart1.ChartAreas["ChartArea1"].AxisY.Title = "Date";
            Chart1.ChartAreas["ChartArea1"].AxisX.Title = "Time";

            //set Chart Marker Color
            Chart1.Series["Series1"].MarkerColor = Color.LightBlue;
            Chart1.Series["Series2"].MarkerColor = Color.Red;

            // Set point chart type
            Chart1.Series["Series1"].ChartType = SeriesChartType.Point;
            Chart1.Series["Series2"].ChartType = SeriesChartType.Point;

            // Enable data points labels
            Chart1.Series["Series1"].IsValueShownAsLabel = false;
            Chart1.Series["Series2"].IsValueShownAsLabel = false;

            //Chart1.Series["Series1"]["LabelStyle"] = "Center";

            // Set marker size
            Chart1.Series["Series1"].MarkerSize = 5;
            Chart1.Series["Series2"].MarkerSize = 5;

            // Set marker shape
            Chart1.Series["Series1"].MarkerStyle = MarkerStyle.Circle;
            Chart1.Series["Series2"].MarkerStyle = MarkerStyle.Circle;

            // Enable 3D
            //Chart1.ChartAreas["ChartArea1"].Area3DStyle.Enable3D = true;
            UltraWebTab1.SelectedTab = 0;
            UltraWebTab1.Visible = true;

Html Code is

<asp:Chart ID="Chart1" runat="server" Width="812px" Height="696px" ImageLocation="~/temp/ChartPic_#SEQ(300,3)"
                                   ImageType="Png" BackColor="WhiteSmoke" Palette="None" BorderColor="26, 59, 105"
                                   BorderDashStyle="" BackSecondaryColor="White" BackGradientStyle="TopBottom" Visible="true"
                                   BorderWidth="2" ImageStorageMode="UseImageLocation">
                                   <Legends>
                                       <asp:Legend Enabled="False" IsTextAutoFit="False" Name="Default" BackColor="Transparent"
                                           Font="Trebuchet MS, 8.25pt, style=Bold">
                                       </asp:Legend>
                                   </Legends>
                                   <BorderSkin SkinStyle="None"></BorderSkin>
                                   <Series>
                                       <asp:Series MarkerSize="10" Name="Series1" ChartType="Point" BorderColor="180, 26, 59, 105"
                                           ShadowOffset="1" Font="Trebuchet MS, 9pt">
                                       </asp:Series>
                                       <asp:Series MarkerSize="10" Name="Series2" ChartType="Point" BorderColor="180, 26, 59, 105"
                                           ShadowOffset="1" Font="Trebuchet MS, 9pt">
                                       </asp:Series>
                                   </Series>
                                   <ChartAreas>
                                       <asp:ChartArea Name="ChartArea1" BorderColor="64, 64, 64, 64" BorderDashStyle="Solid"
                                           BackSecondaryColor="White" BackColor="Gainsboro" ShadowColor="Transparent" BackGradientStyle="TopBottom">
                                           <Area3DStyle Rotation="10" Perspective="10" Inclination="15" IsRightAngleAxes="False"
                                               WallWidth="0" IsClustered="False" />
                                           <AxisY LineColor="64, 64, 64, 64">
                                               <LabelStyle Font="Trebuchet MS, 8.25pt" />
                                               <MajorGrid LineColor="AliceBlue" />
                                           </AxisY>
                                           <AxisX LineColor="64, 64, 64, 64">
                                               <LabelStyle Font="Trebuchet MS, 8.25pt" />
                                               <MajorGrid LineColor="64, 64, 64, 64" />
                                           </AxisX>
                                       </asp:ChartArea>
                                   </ChartAreas>
                               </asp:Chart

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