Using INDIRECT() on Date type header

I am trying to dynamically calculate Week over Week for a spreadsheet, as new data is added to the columns every week on the date in the header. My data looks like so:

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WoW for A should be 120/100-1 = 20%. WoW for B should be 140/120-1 = 16.67%.

I was trying to use indirect() in cell B2 to calculate WoW like so: =INDIRECT(IF(MATCH(TODAY(),C$1:G$1,0),TODAY(),""))/INDIRECT(IF(MATCH(TODAY()-7,C1:G1,0),TODAY()-7,""))-1 however it just returns #REF!.

Any idea what I am doing wrong? Thanks!

P.S. On second thought it looks like this will fail on today()+1 through today()+6 so if there is a way to perhaps update the match() that would be highly appreciated

Will you please attach a SMALL sample Excel workbook (10-20 rows of data is usually enough)? Please don't attach a picture of one (no-one will want to re-type all your stuff before starting).

1. Make sure that your sample data are truly REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired solution is also shown (mock up the results manually).

3. Make sure that all confidential information is removed first!!

4. Try to avoid using merged cells. They cause lots of problems!

Unfortunately the attachment icon doesn't work at the moment. So, to attach an Excel file you have to do the following: Just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.