ALV grid display

Hello all,

Date is the main selection criteria in my selection screen

Once the user gets the ALV grid display output screen, he should be able to forward or backward the date

so accordingly the display changes

So req is, i should create two pushbuttons in that ALV grid display output screen where user can forward or backward the date directly, no need to go back to the selection screen once again

How can i handle this......

sample code plz..