Not even going to attempt to make your data set and can't code against a picture.   One reason we ask for a working data step is so we can tell the properties of the variables. It is amazing how many people ask questions about values not working and find out they are trying to add/subtract/ some other calculation with character values which turns out poorly for any number of reasons.   Excel and other spreadsheets are particularly crappy for data because each cell can have different types of values. So what you "see" as a date may well be text. And pictures of spreadsheet are just right out. ... View more