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For example, the ISO standard defines the year format as YYYY, the year/month format as YYYY-MM, and the year/month/day format as either YYYYMMDD (basic format) or YYYY-MM-DD (extended format).

The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.

Date/Time Formats FormatDescriptionMM/DD/YYTwo-digit month, separator, two-digit day, separator, last two digits of year (example: 12/15/99)YYYY/MM/DDFour-digit year, separator, two-digit month, separator, two-digit day (example: 1999/12/15)46 more rows

Allow dates to be displayed with a DD MMM YYYY format. For example, , . Because dates are seen in DD/MM and MM/DD formats in different places, not just in this service, allowing abbreviations for months clears up the confusion.

The ISO 8601 format YYYY-MM-DD (2022-10-18) is intended to harmonize these formats and ensure accuracy in all situations. Many countries have adopted it as their sole official date format, though even in these areas writers may adopt abbreviated formats that are no longer recommended.

ISO 8601 dictates an internationally-recognized format for representing dates as follows: YYYY-MM-DD, such as 2020-03-13.

Yyyy-MM-dd ? Example: 2013-06-23. yyyyMMddTHH:mmzzz ? Example: 20130623T-0500.

The day is written first and the year last in most countries (dd-mm-yyyy) and some nations, such as Iran, Korea, and China, write the year first and the day last (yyyy-mm-dd).

The international standard recommends writing the date as year, then month, then the day: YYYY-MM-DD.

Date/Time Formats FormatDescriptionDD/MM/YYYYTwo-digit day, separator, two-digit month, separator, four-digit year (example: 15/12/1999)MM/DD/YYYYTwo-digit month, separator, two-digit day, separator, four-digit year (example: 12/15/1999)46 more rows