For those not able to write such a batch file, many ready-made bulk file renaming applications are available e.g. https://www.techpout.com/best-bulk-rena ... y-windows/
I used the free utility https://www.bulkrenameutility.co.uk/ on my old PC because of the wide choice of options it offers, including correcting the created or modified dates, as well as changing names with regular expressions, renumbering, etc.
Both the viewer included with the legacy Cumulus, and the viewer in the MX interface, work with the different file naming allowed in settings. For example, my yearly reports using 'Blwyddyn'yyyy".txt" can be viewed, and yet have a name which describes their content and keeps them nicely at the top of my Raspberry Pi file manager.
My own report displaying web page has of course been written to use my naming choices.