In today's terms: XI-VIII-MCMLXXXI
8 8 1981 in Roman numerals is VIII VIII MDCCCCLXXXI or IIX IIX XXMMI. Note that 1981 is not MCMLXXXI in Roman numerals.
It is: VIII-XI-XI
XI-VIII-MM
It is: VIII-XI-MMXII
It is: X-VIII-XI
Xi viii mcmlxxxi
It is: XI-VIII-X
XLII is 42 in Roman numerals. XXXIV is 34 in Roman numerals. The difference between them is 8, or VIII in Roman numerals.
In today's modern conversion it is: XI-VIII-MCMLXXXVIII
The date 8-14-2009 in Roman numerals would be VIII.XIV.MMIX
VIII XV MMVII in Roman Numerals.
If you mean 822 then the equivalent in Roman numerals is DCCCXXII