One of our users on Windows 8.1 using Excel 2010 is not able to change the date formatting in an existing Excel spreadsheet. His date format defaults to using commas, and I cannot set it to use forward slashes. I have tried changing to a different language within Excel, and back to English US with no resolution. (Please see attached screen shot) I have the same operating system and also have Excel 2010, and the same spreadsheet opens fine on my machine with the dates showing up as they should with the forward slashes.
I'm guessing there is a simple setting somewhere in Excel to fix this. Any help would be appreciated!