How to write a formula in Excel that will calculate week number?

Posted on 2011-09-11
Medium Priority
Last Modified: 2012-06-27
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
Question by:futr_vision
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Expert Comment

by:barry houdini
ID: 36520167
I don't see any attachment....

but if you have number of days in A2 the try this formula for week number in B2


regards, barry
LVL 50

Accepted Solution

barry houdini earned 2000 total points
ID: 36520169
....OK, now I see the attachment!

The formula I suggested should work for you, put in B2 and copy down.....

regards, barry

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