display monthwise grouping in a classic report

hi everybody

i have created one report i.e payroll analysis…on that report it was displaying based on the year wise item in the report…but i have to display for monthly wise items…so i added a groupheader field i added the related field which was retrieving the date for displaying items…Eventhough it was not getting.

Plz suggest any ideas

You can try this logic

http://mibuso.com/blogs/mohana/2011/02/11/monthly-purchase-invoices-in-chart/

thank u mohana

welcome