The way the Romans would have notated March 28, 2010 would be:
A.D. V KAL. APR. MMDCCLXIII AUC
Read literally as "five days before the Kalends of July 2763 since the foundation of the city (of Rome)
If you're just looking for the numbers in our current Date system, it would be:
III XXVIII, MMX
3/28/2010
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March 28, 2010 in Roman numerals is written as XXVIII.III.MMX.
III-XXVIII-MCMLXXXV
XXVIII-II-MMX
IX-XXVIII-MMX
VI-XXVIII-MMX