How do you say the number of 2007 and 2015 in English? (I mean the year of 2007/2015 )
I know we can say the 2007 and 2015 (the year of 2007/2015) in different ways ,but I want to know which one is most commonly used in Spoken English and which we can use in formal situation (when deliver a speech ) : For example: two thousand and seven , ,twenty o seven,two o o seven,twenty fifteen...,BTW, Is there any difference between American Eng and British Eng ? thank you so much .