CONCATENATE(right(year(MONTHDELTA(today(),+3)),2),"0",roundup(MONTH(MONTHDELTA(today(),+3))/3),"&",right(year(MONTHDELTA(today(),0)),2),"0",roundup(MONTH(MONTHDELTA(today(),0))/3),"&",right(year(MONTHDELTA(today(),-3)),2),"0",roundup(MONTH(MONTHDELTA(today(),-3))/3), "xxxxxxxxxxxxx" + FORMAT(DATEINWEEK(TODAY()-7,-1),"yyyyMMdd"))