ABSTRACT
When using British English, dates should be written as follows:
21 February 2013 – not 21st February 2013 or February 21, 2013
7 October 2015 – not 07 October 2015
1989–90 – not 1989–1990 or 1989/90
However, dates are written differently in American English, since the month is placed before the day, and a comma is often placed after the day. For example, February 21st, 2013 or October 7th, 2015.