In today's terms: I-I-MCMXCI
January 18th, 1991 in roman numerals would be: I/XVIII/MCMXCI
In the same order as asked, "MCMLXXVII/I/I" The "/" is just to separate, and is not to deal with the roman numerals in any way.
I-I-MMXI
I-XXX-MCMXCI
Today's way of converting 1-5-1991 into Roman numerals is I-V-MCMXCI. But the Romans themselves in times past would have probably wrote the number 1991 as MDCCCCLXXXXI.
Roman numerals represent numbers not words. January is the first month and the Roman numeral for 1 is I.
I/i/mmxi
I-XXVII-MCMXCI
It is normally only customery to dislpay years in roman numerals. 17 = XVII = 10 + 5 + 1 + 1 3 = III = 1 + 1 + 1 1991 = MCMXCI = 1000 + (1000 - 100) + (100 - 10) + 1 So 17/03/1991 = XVII / III / MCMXCI
1991
January 13 1957 = 1/13/1957 = I/XIII/MCMLVII
To write the date in Roman numerals, you would convert the numbers in the date to their Roman numeral equivalents. For example, January 1, 2022 would be written as I.I.MMXXII.