MCMLXXVII
1977 in roman numerals is 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.
1977 = MCMLXXVII 1978 = MCMLXXVIII
It is already in Roman numerals and in today's terms it represents 1977
MCMLXXVII
In today's modern notation of Roman numerals they are the equivalent of 12-11-1977
November 11 = XI 1977=MCMLXXVII
XII-XXII-MCMLXXVII
XI IX MCMLXXVII
In today's terms:- IX-XVI-MCMLXXVII
That is not a properly formed Roman Numberal. MXM is not proper. If it is supposed to be MCMLXXVII the number would be 1977
In today's modern notation of them: IV-XXX-MCMLXXVII