How can I create group by week numbers in a schedule?

I am trying to create a report of a base roster so that a person might be able to print out all the work they have to do over the cycle.  I've managed to report according to date, and group weekly by date.  However I am trying to input a count of week numbers

Week 1
                        Sunday 14/01/2008 <0>
                        Monday 15/01/2008  E
                        Tuesday 16/01/2008 E
Week 2
                        Sunday 21/01/2008 <0>
                        Monday 22/01/2008  E
                        Tuesday 23/01/2008 E

The dates exist in the database, but the week numbers do not, so I need some way of calculating them I think!

Many thanks in advance
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I don't think I understand how you are defining week 1.
k1ss0ffAuthor Commented:
Sorry, there is a template start date week 1 starts on the Sunday which is the template start date...
How does the report know what date week 1 starts on?
Is it hard coded into a variable or is it on the input data or what?
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If the first is the first group in the report, you can use the special field GroupNumber to get the week number.

k1ss0ffAuthor Commented:
I managed to work it out using a formula -


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Recommend this be closed with no points to experts.  The comment from mlmcc has nothing to do with the final answer

This should be PAQ/Refund.  The suggested comment has nothing to do with the answer

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