1=I 2=II 3=III 4=IV 5=V 6=VI 7=VII 8=VIII 9=IX 10=X 11=XI 12=XII 13=XIII 14=XIV 15=XV 16=XVI 17=XVII 18=XVIII 19=XIX 20=XX
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XLIII
In todays notation of Roman numerals: XVIII-VII-MCMLXXXI
3505 can be expressed as 1000 + 1000 + 1000 + 500 + 5. Translate that to Roman Numerals and you get MMMDV.
XXI-July-MM
X-XXVII-V