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Sydney Time

about time ...

Solar Clock - Sydney Royal Botanical Garden
©2006 Gabriel Ditu
Time is a basic component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects.

Daylight saving time (DST) is the convention of advancing clocks so that afternoons have more daylight and mornings have less.

In Australia different states have different rules:

  • Queensland and Northern Territory does not have DST
  • New South Wales, Victoria, Australian Capital Territory (Canberra) and Tasmania observe DST
  • Western Australia is in a three year trial period.

In Sydney the Daylight Saving Time starts on the first Sunday in October at 2 AM and ends on the first Sunday in April at 3 AM.

Australian Time Zones
CityStateStandard TimeDaylight Time
SydneyNSWAESTUTC+10AEDTUTC+11
MelbourneVICAESTUTC+10AEDTUTC+11
BrisbaneQLDAESTUTC+10
HobartTASAESTUTC+10AEDTUTC+11
Broken HillNSWACSTUTC+9.5ACDTUTC+10.5
AdelaideSAACSTUTC+9.5ACDTUTC+10.5
DarwinNTACSTUTC+9.5
PerthWAAWSTUTC+8AWDTUTC+9
Currently, where applicable, Daylight Saving Time is Off

NOTE: Coordinated Universal Time (UTC) is a high-precision atomic time standard. UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds announced at irregular intervals to compensate for the Earth's slowing rotation and other discrepancies. This allow UTC to closely track Universal Time (UT), based on the Earth's angular rotation.

The difference between UTC and the old Greenwich Mean Time (GMT) is less than 0.9 second. In most cases we can consider that UTC = GMT

Time zones are expressed as positive or negative offsets from UTC. Local time is UTC plus the time zone offset for that location, plus an offset (typically +1) for daylight saving time, if in effect. UTC replaced GMT on 1 January 1972 as the basis for time reference in different regions.

DST history in NSW...

Central Station - Sydney
©2006 Gabriel Ditu
DST was introduced nationally during World War I from 1 January 1917 to 25 March 1917 and during World War II for three summers, beginning on 1 January 1942.

DST was introduced again in NSW on 31 October 1971 after the Standard Time Act 1971 was voted by the NSW Parliament.

After a referendum held on 1 May 1976, where 1,882,770 electors were in favor; 868,900 were against and 35,507 votes were informal, DST was adopted on a permanent basis.

Currently in NSW the Daylight Saving Time starts on the first Sunday in October and ends at 3 am summer time on the first Sunday in April.

more...

For more information and astronomy enquiries contact the Sydney Observatory:

Watson Road, Observatory Hill
The Rocks NSW
PH: (02) 9241 3767
Web Site: Sydney Observatory

29 June
1942 - General Thomas Blamey reorganises the army for the defence of Australia.
Australian slang
  • RSL Returned Services League club
  • gyno gynaecologist
  • throw up vomit
  • prawn shrimp
  • it's gone walkabout it's lost
  • sheila a young woman
  • xxx kisses (used at the end of a letter)
  • outback interior of Australia
  • Old Dart England
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