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Time in Australia

time zones in Australia

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 17, 2026
Entity authorityQ187180 ↗
Source-derived summary

Australia uses three main time zones: Australian Western Standard Time (AWST; UTC+08:00), Australian Central Standard Time (ACST; UTC+09:30) and Australian Eastern Standard Time (AEST; UTC+10:00).

Time is regulated by the individual state governments, some of which observe daylight saving time (DST). Daylight saving time (+1 hour) is used between the first Sunday in October and the first Sunday in April in jurisdictions in the south and south-east:

New South Wales, Victoria, Tasmania, Jervis Bay Territory and the Australian Capital Territory switch to the Australian Eastern Daylight Saving Time (AEDT; UTC+11:00), and

South Australia switches to the Australian Central Daylight Saving Time (ACDT; UTC+10:30).

Standard time was introduced in the 1890s when all of the Australian colonies adopted it. Before the switch to standard time zones, each local city or town was free to determine its local time, called local mean time. Western Australia uses Western Standard Time; South Australia and the Northern Territory use Central Standard Time; while New South Wales, Queensland, Tasmania, Victoria, Jervis Bay Territory and the Australian Capital Territory use Eastern Standard Time. Daylight saving time is not used in Western Australia, the Northern Territory, or Queensland.

The Cocos (Keeling) Islands uses UTC+06:30 year round, Christmas Island uses UTC+07:00 year round, while Norfolk Island uses UTC+11:00 as standard time and UTC+12:00 as daylight saving time.

History

The first serious proposal for Australian standard time came the form of a paper inspired by Sandford Fleming's Canadian system of uniform time zones which Sir Charles Todd, the builder of the Overland Telegraph and South Australian Postmaster-General and an advocate for standard time in Australia, presented to the Intercolonial Postal Conference in Sydney in 1891. Before standardisation, most of the colonies had previously followed their own times, based upon the times of their capital cities as set at the local observatory.

Editorial summary

This brief starts where responsible research should: with the source description of “Time in Australia” as time zones in Australia. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1891—that can be checked directly. The selected authority fields contribute no independent date. The account is most persuasive where Time, Australia and time can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as time zones in Australia. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q187180. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1891.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Time in Australia”, its source revision and the description used here.
  2. Expand the search: follow Time in Australia primary sources, Time in Australia archive and Time research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Time in Australia”?
  2. Which institution is responsible for the underlying evidence?
  3. Which cited source is closest to the event, object or claim?
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Source & attribution

This entry incorporates text from “Time in Australia” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.