Date and time notation in Australia

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Date and time notation in Australia [refresh]
Full date5 February 2023
All-numeric date2023-02-05
3:03 am

Date and time notation in Australia most commonly records the date using the day-month-year format (5 February 2023), while the ISO 8601 format (2023-02-05) is increasingly used for all-numeric dates. The time can be written using either the 12-hour clock (3:03 am) or the 24-hour clock (03:03).


Australians typically write the date with the day leading, as in the United Kingdom and New Zealand:

  • 5 February 2023
  • 2023-02-05 or 05/02/2023

The month–day–year order (February 5, 2023) is sometimes used, usually informally in the mastheads of magazines, schools, newspapers,[1][2] advertisements, video games, news, and TV shows. MDY in numeric-only form (02/05/2023) is rarely used.

The ISO 8601 date format (2023-02-05) is the recommended short date format for government publications.[3] The first two digits of the year are often omitted in everyday use and on forms (05/02/23).

Weeks are most identified by the last day of the week, either the Friday in business (e.g., "week ending 19/1") or the Sunday in other use (e.g., "week ending 21/1"). Week ending is often abbreviated to "W/E" or "W.E." The first day of the week or the day of an event are sometimes referred to (e.g., "week of 15/1"). Week numbers (as in "the third week of 2007") are not often used, but may appear in some business diaries in numeral-only form (e.g., "3" at the top or bottom of the page). ISO 8601 week notation (e.g. 2023-W05) is not widely understood.[citation needed] Some more traditional calendars instead treat Sunday as the first day of the week.


The Australian government allows writing the time using either the 24-hour clock (03:03), which is commonplace in technical fields such as military, aviation, computing, navigation, transportation and the sciences; or the 12-hour clock (3:03 am). The before noon/after noon qualifier is usually written as "am" or "pm". A colon is the preferred time separator.[4]


  1. ^ "Latest News". News Corp Australia. Archived from the original on 4 November 2017. Retrieved 4 November 2017.
  2. ^ "The West Australian Demo". The West Australian. 16 August 2016. Archived from the original on 1 September 2017. Retrieved 4 November 2017.
  3. ^ Style manual for authors, editors and printers (6 ed.). John Wiley & Sons Australia. 2002. p. 171. ISBN 978-0-7016-3647-0.
  4. ^ "Numbers and measurement". GOV.AU Content Guide. Retrieved 23 July 2018.