In today's modern conversion it is: XI-VIII-MCMLXXXVIII
August-VIII-MCMLXXXVIII
It is: VIII-XI-XI
XI-VIII-MM
It is: VIII-XI-MMXII
August = 8th month = 8 = VIII 13 = XIII 1988 = MCMLXXXVIII
Xi viii mcmlxxxi
It is: XI-VIII-X
It is: X-VIII-XI
In today's terms: XI-VIII-MCMLXXXI
XLII is 42 in Roman numerals. XXXIV is 34 in Roman numerals. The difference between them is 8, or VIII in Roman numerals.
8 8 1981 in Roman numerals is VIII VIII MDCCCCLXXXI or IIX IIX XXMMI. Note that 1981 is not MCMLXXXI in Roman numerals.
The date 8-14-2009 in Roman numerals would be VIII.XIV.MMIX