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)
10-15-2021 = October 15th, 2021
Convert and Write Out the Date, in Words:
October the fifteenth, twenty twenty-one
or: October the fifteenth, two thousand twenty-one
In American English the month is said first, followed by the day.
* The definite article 'the' can be left out:
October fifteenth, twenty twenty-one
or: October fifteenth, two thousand twenty-one
British English (UK)
15-10-2021 = 15th October, 2021
Convert and Spell Out the Date, in Words:
the fifteenth of October, twenty twenty-one
or: the fifteenth of October, two thousand and twenty-one
In British English the day is said first, followed by the month.