Hi again.
Apoligies for the formula giving an error. I don't have Excel on this laptop and checked it in OpenOffice. I think the only difference is that Excel used commas where OpenOffice uses semicolons.
Here it is with commas:
=RIGHT(TEXT(100+1+MOD((MONTH(A1)+7),12),"#"),2) & "_" & RIGHT(TEXT(YEAR(A1)-1*(MONTH(A1)<5),"#"),2)
Now the month numbers:
You said you wanted 11/05/2008 to show as 01_08
so
11/06/2008 shows as 02_08
11/07/2008 shows as 03_08
.
.
.
11/11/2008 shows as 07_08
11/12/2008 shows as 08_08
Then do you want
11/01/09 to show as 09_09 or as 09_08?