Making static column dynamic and mapping the column again to its data

Hi I have column names from my input files as jan-23, feb-23, march-23

My condition is when the workflow will run on October-23 the it should pick up data from Sep-23 which is a static column . ( It will go on for the month it will be run)

How can I handle when year changes and the column name will also change like jan-24, feb-24