If I enter a date in Excel it correctly defaults the format to use my regional settings which are UK so it appears as dd/myy/yyyy, but if I then load the spreadsheet into your control it formats it as m/d/yy.
See attachment that contains the Excel file and a screenshot of Excel v ExpressSpreadSheet
You will need to change your regional settings to UK to see this behaviour.
Stephen,
I have reproduced the described behavior and forwarded this ticket to our developers for research.
I have also a relevat issue I think.
If I use DateNumberFormat: string = 'mmmm d, yyyy'; or the 'd mmmm , yyyy'; the month name is displayed in English, although I'm from Greece and I have greek regional settings.
Thank you for your comment.