Read files based on date

e.g.

arrFilesFI  = 
new DirectoryInfo(YourDirPath).GetFiles().Where(Function (x) x.CreationTime.Date < Now.Addays(-15).Date).toArray

Or
arrFilePaths =

arrFilesFI  = 
new DirectoryInfo(YourDirPath).GetFiles().Where(Function (x) x.CreationTime.Date < Now.Addays(-15).Date).Select(Function (f) f.FullName).toArray