Hello, I'm new to the forum and need your help. I have a spreadsheet coming where I need to validate the data columns on a monthly basis. Im thinking of maybe write a macro to do such. Column data validation includes checking to see if the date Is within requested range, whether the column date is within 30 days of the dates in the previous column, etc. Please advise how I can go about do that. I'm thinking coming up with a macro to validate the data as they come in. Any tips and suggestion on how to do this is very much appreciated.