datetimeformatinfo

Is String.Format and DateTimeFormatInfo pluggable/extensible?

So for example lets say when I string.format a date and use the string "or" in format pattern I want that converted to the ordinal value of the Date. ie string.Format("{0:ddor MMM yyyy}.", DateTime.Now) should output 1st Jan 2010 See below for how to derive the ordinal numbers http://stackoverflow.com/questions/69262/is-there-an-...