I deleted it. the first time I tried it, it didn't work (for some unknown reason). But when I saw the 2nd post, I went back and tried it again.
Every so often either it must be my install of Excel or (more likely) I typed something different than what I thought I typed (as a formula). Sometimes I will try so many variations of a formula that I can't remember what I have & haven't tried. Either during my sleep or fresh the next day, it comes to me what I need to do.