I'm running Windows Vista. I went to the Control Panel and changed the Regional and Languages options so the date would read YYYYMMDD. They work fine now, but in printing my contact sheets in PE11 the date still reads MMDDYYYY.
Right in that case the date format is regional configuration. For example on my British English system, my settings can only be as shown in this picture:
I believe Japanese have the format yyyy/mm/dd. I am not sure it is your worth changing the regional settings because it might affect other things which we may never think of.
Sorry, can't help you here.