The international standard recommends writing the date as year, then month, then the day: YYYY-MM-DD. So if both the Australian and American used this, they would both write the date as 2019-02-03. Writing the date this way avoids confusion by placing the year first. Much of Asia uses this form when writing the date.

How do you write the date in 2021?

So 1/12/2021 is January 12th, 2021. And notice how the date is written: 12th. If you say this date out loud you'll say: “January twelfth, twenty twenty-one.”

How do you write a date in a formal letter?

When writing the date in a formal letter, you should write it in full with no abbreviations, for example, "December 12, 2019." Avoid abbreviating the month or using the numerical format "12-12-2019."