1999
In today's terms MCMXCIX are the Roman numerals for 1999
But the Romans themselves would have probably calculated 1999 on an abacus counting device as MDCCCCLXXXXVIIII and simply wrote it out as IMM (-1+2000 = 1999)
Today's rules governing the Roman numeral system were introduced during the Middle Ages but that was centuries after the decline of the Roman Empire.
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1999
1999 = MCMXCIX
1999 = MCMXCIX MCMXCIX; M = 1000, CM = 900, XC = 90, IX = 9
roman numeral for march 20 1999 is as follows . 03-20-1999 is written as . IIi=XX-MCMXCIX.
1000 = M, 900 = CM, 90 = XC and 9 = IX. so 1999 would be MCMXCIX.