Match the values of the inner-most values to the header of the repeater

I am trying to build a calendar that would show all of the employees and if they worked that day in a month. I plan on making it a table. What would be the best way to do this?

class Workers{
  int ID,
  string name,
  list<Work> workDates
}

class Work{
  dateTime date
}

I'm trying to use nested repeaters. I can already populate the header with the dates. I have also already figured out how to put all the employees and the days they worked. I just have a problem with placing the shift on the spot where the header date is.

I followed this code I found here for my structure:

       <tr class="headerRow">
          <td> &nbsp;</td>
          <asp:Repeater ID="rptDates" runat="server" OnItemDataBound="rptDate_ItemDataBound">
              <ItemTemplate>
                 <td class="header"><asp:Literal ID="litDates" runat="server"></asp:Literal></td>
              </ItemTemplate>
          </asp:Repeater>
       </tr>
       <asp:Repeater ID="rptName" runat="server" ItemDataBound="rptName_ItemDataBound">
          <ItemTemplate>
             <tr>
                <td><asp:Literal ID="litName" runat="server"></asp:Literal></td>
                <asp:Repeater ID="rptShifts" runat="server" OnItemDataBound="rptShifts_ItemDataBound">
              <ItemTemplate>
                 <td><asp:Literal ID="litShifts" runat="server"></asp:Literal></td>
              </ItemTemplate>
          </asp:Repeater>
             </tr>
          </ItemTemplate>
       </asp:Repeater>
    </table>

Currently, my code outputs something like this:

|         | 04-01-2019 | 04-02-2019 | 04-03-2019 | 04-04-2019 |
|---------|------------|------------|------------|------------|
| Worker1 | 04-03-2019 | 04-04-2019 |            |            |
| Worker2 | 04-05-2019 |            |            |            |
| Worker3 | 04-01-2019 | 04-03-2019 |            |            |