Hi All

i at beginners level in CR 2008 and have a problem.
i need to make a report that compares sales figures year to date with the same period last year.

I managed to get my selection formula correct.
{INVOICE_DATE} > Dateadd ('d',1,(currentdate) - (datepart("y",currentdate)))
or
{INVOICE_DATE} in dateadd('yyyy',-1,Dateadd ('d',1,(currentdate) - (datepart("y",currentdate)))) to Dateadd('yyyy',-1,(currentdate))
but how do i group on the date so i get this layout

period revenue
2009-01 2154
2010-01 2568

2009-02 1487
2010-02 1458

and so on.   
Hope someone can point me in the right direction       

if i do your selection formula i get a lot of records that i dont need, i only need last years records to this date, but last year offcourse.

i need it to start in jan last year.
isnt this the same?

that did the trick. Thanks a lot.