MCMLXXVII
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1977 = MCMLXXVII 1978 = MCMLXXVIII
It is already in Roman numerals and in today's terms it represents 1977
MCMLXXVII
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.
In today's modern notation of Roman numerals they are the equivalent of 12-11-1977