If you want to insert the isoweeks in the cells install
http://www.rondebruin.nl/datarefiner.htm
You can insert a column in your table with the isoweek function with this add-in

I have done that using some ISO week functions found on the Net. That
worked fine.


With EasyFilter you can filter and copy to new sheet or workbook to create the reports you want

Thanks. I managed to write both forms from scratch, with some functions
taken from the Net.