Executing macro only once on open

Yes, just run the code if today's date is not in the cell.......

If you want it only to run once, when the workbook is opened, it will check if the cell has today date in it, if not, then it will run the code, and place the date in the cell, so that next time the wb is opened, if first checks the date of the cell to see if it has to run the code or not.