I think in your case Matrix is more appropriate control than a Table.
1.Add a Matrix to your report:
2.Select [Date] as a columns source:
3.In the right bottom area of the Design tab you will find Column Groups pane, right click on the existing group then Add Total -> After:
4.After some manipulations your report in design mode will look like following:
5.And eventualy in the preview mode:
Hope it helps.