The Roman numeral MMVI represents the number 2006 Roman numerals ALWAYS use CAPITAL LETTERS (MMVI, not Mmvi or mmvi)
If you mean 10-30-2006, then it is: X-XXX-MMVI.
In Roman numerals 2006 = MMVI
It is MMVI = 2000+6 => 2006
XXIX VI MMVI XXVIIII-VI-MMVI or IXXX-VI-MMVI. Note that 29 in Roman numerals is not XXIX as you might have been told or read.