I've attached a sample workbook. Here is the breakdown.
Column C is the "Event Date" this is the date an event happened.
Column D is the "Followup Activity Date", These are the dates for all of the activity going forward for the "Event Date".
Column E or higher(not in the spreadsheet) would be data that relates to the "Followup Activity Date"
For example the "Event Date" might be the day someone signed up for a class or even better started a project. Column E might be what was accomplished and Column D would be the date it was accomplished.
In the workbook you will see two additional columns - A & B. In column A I calculated what number day it is for the entire date range for the Event Date in column C. This was not a problem. What I am stuck on is calculating the week number. The first 7 days will be week 1. The second seven days will be week 2 and so on until we reach the next Event Date which in this workbook would be 6/2/2011
What formula will work? Activity-Report.xlsx