Hello All...I have a worksheet with Sheet1 to Sheet31 (tab). each tab named by date like 8-1-11 to 8-31-11. I make a copy of this worksheet and I want to change all 31 sheets names from 8-1-11-8-31-11 TO 9-1-11-9-30-11. Is there any way or formula, when I change first sheet(tab)'s name to 9-1-11 then rest of changes automatic....or ...or when I change 1st date then the rest of the date changes automatic.... Thanks in advance