Date and time notation in Australia

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Date and time notation in Australia
Full date12 November 2018
All-numeric date2018-11-12
9:24 pm [refresh]

Date and time notation in Australia largely follows conventions from British English, like many other aspects of Australian English. It most commonly records the date using the day-month-year format (12 November 2018), while the ISO 8601 format (2018-11-12) is increasingly used for all-numeric dates. The time can be written using either the 24-hour clock (21:24) or 12-hour clock (9:24 pm).


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

  • 12 November 2018
  • 2018-11-12 or 12/11/2018

The ISO 8601 date format (2018-11-12) is the recommended short date format for government publications.[1] The first two digits of the year are often omitted in everyday use and on forms (12/11/18).

Weeks are most identified by the last day of the week, either the Friday in business (e.g., "week ending 19/1") or the Saturday or Sunday in use (e.g., "week ending 20/1" or "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" or "week of 14/1"). 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. 2018-W46) is not widely understood.[citation needed]


The Australian government allows writing the time using either the 24-hour clock (21:24), which is commonplace in technical fields such as aviation, computing, navigation, and the sciences; or the 12-hour clock (9:24 pm). The before noon/after noon qualifier is usually written as "am" or "pm". A colon is the preferred time separator.[2]


  1. ^ Style manual for authors, editors and printers (6 ed.). John Wiley & Sons Australia. 2002. p. 171. ISBN 978-0-7016-3647-0.
  2. ^ "Numbers and measurement". GOV.AU Content Guide. Retrieved 23 July 2018.