Time zones

Australian time zones (AEST, ACST, AWST), daylight saving, Coordinated Universal Time (UTC) and calculating the time in another city.

Australian time zones

In summer, NSW, ACT, Victoria, Tasmania and SA use daylight saving: clocks go forward one hour. Queensland, the NT and WA do not.

Other countries

Every zone is written as an offset from Coordinated Universal Time (UTC). To convert, find the difference between the offsets. East is ahead; west is behind.

Example 1●●

It is 6 pm in Sydney (UTC $+10$). What time is it in London (UTC $+0$)?

London is $10$ hours behind.

6 pm minus $10$ h $=$ 8 am the same day.

Example 2●●●

A flight leaves Perth (UTC $+8$) at 11 pm and takes $5$ hours to reach Sydney (UTC $+11$ in daylight saving). What is the local arrival time?

Perth time on arrival: 11 pm $+ 5$ h $=$ 4 am.

Sydney is $3$ hours ahead: 7 am the next day.

Flashcards

AEST

UTC $+10$

AWST compared with AEST

2 hours behind

Daylight saving

Clocks go forward 1 hour in summer (not Qld, NT, WA).

Practice

It is 6 pm in Sydney (UTC $+10$). What time is it in London (UTC $+0$)?
Perth 11 pm departure, 5 h flight, Sydney 3 h ahead. Local arrival time?
It is 10 am AEST. What time is it in Perth (AWST)?
It is noon AEST. What time is it in Adelaide (ACST, no daylight saving)?
Which state does not use daylight saving?
Tokyo is UTC $+9$ and Los Angeles is UTC $-8$. How many hours ahead of Los Angeles is Tokyo?
How many hours ahead of Perth (UTC $+8$) is Sydney in daylight saving (UTC $+11$)?
How many hours ahead of London (UTC $+0$) is Sydney in standard time?