MCMLXXVII
1977 in roman numerals is MCMLXXVII.
1977 January 1 is written as I.I.MCMLXXVII in Roman numerals.
1977-78 in Roman numerals is MCMLXXVII-LXXVIII.
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
XI IX MCMLXXVII
XII-XXII-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