Dates
1) In spoken Britain English we use ordinal numbers for dates. We usually say and write the day, then the month, then year. We also usually say the before the days and of before the month.
e.g.
We say: the eleventh of February, two thousand and seven
We write: 11 ( or 11th ) February 2007 or 11/02/07
We say: the thirtieth of August, two thousand and five
We write: 30 ( or 30th ) August 2005 or 30/08/05

2) In American English, we usually say and write the month, then the day, then the year. We don't use of and the.
e.g.
We say: January tenth, nineteen nineteen ninety-seven
We write: January 10 ( or 10th ) 1997 or 01/10/97
we say: October twenty-first, two thousand three
We write: October 21 ( or 21st ) 2003 or 10/21/03