Dynamic table depending on system date.

hi all,

i am having 2 types of data variables P1,P2,P3...P12 for history data and P1,P2,P3...P12 for future data. i need to display a table such that if current period is april(acc to system date) then table will show P1,P2,P3 for history data and P4,P5...P12 for future data in same table. and it got change ,accordingly , every month.

please help

thanks