I'm used to DD.MM.YYYY due to my country settings but I agree the ISO one make much more sense, you start with the larger time metric, the year and end with the more precise one, days or minutes or seconds...

Also the dot will (like here) make software think it's a link or a file extension and forward slash mess up with directories.

However I do name my files as YYYYMMDD to save 2 more characters and still have them by date order even when ordered by file name. I admit that it might be confusion for other when I work in shared workspaces.