Calculate the Date of an Item Based on the Date of a Similar Item in the Previous Month

Sorry - I am not following you at all. You said this:

Quite by accident I have just found someone also having problems with the PrevSheet UDF, not only that they had a solution that works! It is at

HTML Code: 

(not sure if I got that right). Maybe my computer took pity on me and went looking on its own! ;-)

But the link goes to one of YOUR threads on another forum.

So where is the thread by the 'someone' who had the working solution?