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Improved Answer:
It is: VI-December-MMI
December is the XII (12) month of the year.
In today's notation: December-VI-MMIX or as XII-VI-MMIX
It is: 06 = VI
The date 01-06-1981 in Roman numerals is I.VI.MCMLXXXI
The date 13-06-2009 in Roman numerals would be XIII.VI.MMIX
The date 18-06-1990 in Roman numerals would be XVIII.VI.MCMXC
The number 06 in Roman numerals is represented as VI. It signifies the value of 6 in the Roman numeral system.
The Date 06-28-2008 in Roman numerals would be VI.XXVIII.MMVIII
The date 11-06-1988 in Roman numerals would be XI.VI.MCMLXXXVIII
The date 06-12-89 in Roman numerals is VI.XII.LXXXIX and the longer version 06-12-1989 is VI.XII.MCMLXXXIX
VI / XIII / MCMLXXXV
In today's notation of Roman numerals: II-VI-MCML
The date June 6th 2008 can also be written as 06-06-2008 and in Roman numerals this would be VI.VI.MMVIII