It is: XVIII-I-MMXII
CDXC
mcmxliv
2010 in roman numerals = MMX
40 = XL
January would be represented with an I. You would write it as I-XI.
XXIX-January
I/V
January 20th, 2009 can be written as XX.I.MMIX in Roman numerals.
I.III.MCMXCIV
I/i/mmxi
XXVIII.I.MCMLXXXVIII
It is: I-I-MMXII