the answer is..... mmiiiixiii.
Improved Answer:
XIII-April-MMI or as XIII-IV-MMI
13th April 1957 can also be written as 13-04-1957, which in Roman numerals would be XIII.IV.MCMLVII
The conventional conversion of April 13th 1994 into Roman numerals is April-XIII-MCMXCIV whether or not the Romans themselves did it this way is open to question.
It is: III-XIII-MM
January 13th 2000 can also be written as 01-13-2000 and in Roman numerals that would be I.XIII.MM
The date 13th August 2009 can also be written as 13-08-2009, which can be represented by the Roman numerals XIII.VIII.MMIX
The date Auguust 13th 2008 can also be written as 08-13-2008 and in Roman numerals this would be VIII.XIII.MMVIII
The date August 13th 1982 can also be written as 08-13-1982 and this can be represented by the Roman numerals VIII.XIII.MCMLXXXII
You could use roman numerals but then you would need 6 letters: XIII-V-XI.
2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.2012 had 3 Friday the 13ths, in January, April and July. There were 13 weeks between the 13th of January and the 13th of April and also 13 weeks between the 13th of April and the 13th of July.
April 13th 1959 was a Monday.
April 13th 2036 will be a Sunday.
April 13th, 1972 fell on a Thursday.