Step 1:
Download this Julian Calendar for 2008
http://office.microsoft.com/en-us/templates/TC102362721033.aspx
Step 2:
Check out the Julian number for today's date, write it down on paper, leaving a blank area at top.
Step 3:
Check out the Julian number for Sep 6, 2008, and write that number ABOVE the previous number you wrote down.
Step 4:
Subtract the lower number from the higher number. The result is the number of days you are looking to know.