How to Write the Month and Day. When referring to a specific date in the month-day date format, use cardinal numbers (one, two, three) rather than ordinal numbers (first, second, third). This may feel counterintuitive because we normally use ordinal numbers when we “speak” of dates.
In traditional American usage, dates are written in the month–day–year order (e.g. September 14, 2021) with a comma before and after the year if it is not at the end of a sentence, and time in 12-hour notation (3:44 pm).
How do you refer to a date?
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.
Date/Time FormatsFormatDescriptionYYYY-MM-DDFour-digit year, separator, two-digit month, separator, two-digit day (example: 2002-02-02)YYYY-MMFour-digit year, separator, two-digit month (example: 2002-02)YYYYFour-digit year (example: 2002)--MM-DDTwo dashes, two-digit month, separator, two-digit day (example: - -12-02)44 more rows