Financial chart in the role center

I would like to set up a financial chart in the role Center. The chart shows the daily status of our bank accounts in stack colums (y-axis). On the x-axis it shows the status of the last five days (-1D...-5D).

In the diagramm setup I set the start- and enddate for the cart. How can I teach NAV to change the date everyday into the actual date?

Thanks in advance.