5 = v
18 = xviii
1990 = mdcdlxl
Improved Answer:
In today's terms it is: V-XVIII-MCMXC
18 written in Roman numerals is XVIII.
XVIII
In todays notation of Roman numerals: V-XVIII-MCMXCII
Xviii/xi/mxvim
It is: X-XVIII-MMX
The date 18-06-1990 in Roman numerals would be XVIII.VI.MCMXC
18 written in Roman numerals is XVIII.
18 is XVIII 12 is XII 1990 = MCMXC
xviii
XVIII
In todays notation of Roman numerals: V-XVIII-MCMXCII
XVIII-IX-MCMXC
XI-XVIII-MMX
XVIII-XI-MMX
It is: II-XVIII-MMXI
Xviii/xi/mxvim
It is: X-XVIII-MMX