Date Stamp in Excel

I am looking or a way to date stamp Excel spreadsheets with a creation date that won’t change when the spreadsheet is updated. I do not want to have to key in the date, it should be an automatic date stamp. I saw something that said naming the formula ‘=TEXT(TODAY(),”dd-mmm-yyyy”)’ and using that range name where you want the date stamp would work, however, everytime I re-open the worksheet, the today() function updates the date. Back in the day, I used to create date stamps in a Lotus macro that didn’t change. Anybody know a way?