If you want the date value to appear in month, day, year order with slashes such as 01/01/1990 then the format is MMDDYY10. 16798 would be 12/28/2005. If you want that to be day, month, year then the format is DDMMYY10. 16798 would be 28/12/2005.
If you expect the formatted value of 16798 to appear as 01/01/1990 then you have a lot of manipulation to do and are missing the rules for how to do that.
There are many different date formats available, plus you can create your own. So it is a good idea to make sure that you describe using words, or at least abbreviations, of the pieces of the date to display along with an example.
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