If you put that formula in Cell A2 (always giving you the latest Monday), and then
Cell A3 = A2 + 1 (This is Tues)
Cell A4 = A3 + 1 (This is Wed)
Cell A5 = A4 + 1 (Etc)
Cell A6 = A5 + 1 (Etc)
Cell A7 = A6 + 1 (Etc)
Cell A8 = A7 + 1 (Etc)
You now have your dates along the left hand side of your chart. The next trick is data in your chart. Maybe Column B is # Widgets Made and Column C is # Windgets Sold.
On a separate tab called Data, I'd have
Column A = Date
Column B = Widgets Made
Column C = Widgets Sold
Back in your chart,
Cell B2 = Vlookup(A2,Data!$A$2:$C$1000,2,0)
Cell C2 = Vlookup(A2,Data!$A$2:$C$1000,3,0)
{These formulas find the dates in your chart over in your data and pulls back the corresponding widgets sold or made}
Copy B2 and C2 down through row 8. This creates a dynamic chart of data where the Monday is almost the most recent passed, the rest of days follow in line, and the data is based on what you recorded on your data tab.
Attach a graph based on that chart and when the data changes, the graph will change.
There are some deep ideas here if this isn't part of your "normal" Excel skills. Try to duplicate the simple idea I gave and learn from it.
Jeff