Group by 7 day increments

GroupExample.xlsRather than grouping by a week, I need to create groups of 7-day increments.  I have a list of patients that sums the amount of treatment time received per day.  Then, I need to group these in 7-day increments (and look for how many times they met the 180 minute goal in that period).  

The starting date of the treatments is different for each patient, as is the ending date.  I have attached an example which demonstrates how I have it now (grouped by week), and how it should look (grouped by 7-day increments).  I am new to Crystal, but it seems to me that you should be able to change grouping increment, I just cannot figure out how.  

Thanks for your help.
dizmaAsked:
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mlmccCommented:
You can't really change the grouping increment however, you could change the treatment dates so the dates always start on a Monday.

You could also do this with manual grouping fairly easily

Do you have other data available to the report?

mlmcc
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peter57rCommented:
You can't change the built-in meanings but if you include a simple sql query in your data source then it should be possible to do what you want.

Assuming your current source is a table, then you need to go back into the database expert and  use the AddCommand option to include a query that gets the minimum date for each patient.

The query must be written in the sql dialect of your database but will be something like...

Select PatientID, min(yourdatefieldname) as MinDate from yourtablename Group By PatientId

You can then join this to your current table on PatientID fields, which in effect attaches the patient's min date value to every record.
This allows you to create a formula field in the report, to give the week number,  which would be..

({table.yourdatefieldname} - {command.MinDate}) \7 +1      //note \ not /

You can then group on this field (within your patient group, of course).
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dizmaAuthor Commented:
Thank you so much.  Very clean approach and well described!
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