XL97 – Add the “last edited” time in a

I’d like to know if it’s possible to add in a cell, the last time the spreadsheet was updated by someone. I know there’s the “&time” stuff that can be put in the header, but that’s not whats the user want. He’d like, in a cell, to have the last timethe workbook was updated and of course that this info changes as soon as it’s edited. I’ve foudn the =TODAY()function, but it only displays the current date and time, which is not great as it changes each time you open the sheet.

Any idea ?

Config : XL97 Pro SP2