11 20 1980
xi xx mcmlxxx
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March XXI MDCCCCLXXX (1980) or March XXI XXMM (2000-20). Note that the Roman numerals for 1980 are not MCMLXXX.
November is 11 so XI-XX-MCMXCIX
20 is Arabic Numerals XX is Roman Numerals.
XX is the number 20 in Roman numerals. xx
XX is the number 20 in Roman numerals.