In American English date representation, the month comes before the day, followed by the year. In British English the day comes before the month, followed by the year.
American English (US)
10-21-2018 = October 21st, 2018
Convert and Write Out the Date, in Words:
October the twenty-first, twenty eighteen
or: October the twenty-first, two thousand eighteen
In American English the month is said first, followed by the day.
* The definite article 'the' can be left out:
October twenty-first, twenty eighteen
or: October twenty-first, two thousand eighteen
British English (UK)
21-10-2018 = 21st October, 2018
Convert and Spell Out the Date, in Words:
the twenty-first of October, twenty eighteen
or: the twenty-first of October, two thousand and eighteen
In British English the day is said first, followed by the month.