Making filepath variable

Hi,

if you are looping through the list of files using this filter :

"C:\users\name\desktop\folder\" & i & "Q\??_" & x & y & "_??.xls"

if we break this further & "Q\??_" & x & y & "_??.xls" -> the first two ?? stands for the day , what does x and y do ? and the last two ?? marks are for the year.

What is the output of this code ? do you see any spaces ?