your link is said to change the week starts name. But here my requirement is rolling one day, that means in the first-week result is between 1st Jan to 7th Jan, but I have to move that period like 2nd Jan to 8th Jan.
I used Week(Date+1) as WeekNumber.
above function works for me ...can you tell me any other way to do that.
As seen on the Qlik help page for the week() function, the second parameter can be used to change the day you want weeks to start on. So in your case (assuming you want your weeks to start on Tuesday):