Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Perth to Ireland

-7h

Perth

AWSTSOURCE

Australia · UTC+08:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Ireland

IST

UTC+01:00☀ DST active

HH05

MM00

05:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Perth

Ireland

12:00 AM

5:00 PM-1

2:00 AM

7:00 PM-1

4:00 AM

9:00 PM-1

6:00 AM

11:00 PM-1

8:00 AM

1:00 AM

10:00 AM

3:00 AM

12:00 PM

5:00 AM

2:00 PM

7:00 AM

4:00 PM

9:00 AM

6:00 PM

11:00 AM

8:00 PM

1:00 PM

10:00 PM

3:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

AWST and IST on the World Map

The map below highlights the AWST (Australian Western Standard Time) and IST (Greenwich Mean Time) timezone regions across the globe.

AWST Zone

→

IST Zone

Explore all world timezones interactively →

AWST – Australian Western Standard Time

UTC+08:00

Australian Western Standard Time (AWST) is the time zone for Western Australia, 8 hours ahead of UTC.

Countries in AWST

Australia (Western Australia)

Major Cities in AWST

PerthMandurahBunburyGeraldton

Key Facts about AWST

•Western Australia does not observe daylight saving time.
•Perth is the most isolated major city in the world.
•AWST is the same offset as China Standard Time and Singapore Time.

Daylight Saving:No – UTC+08:00 year-round

Learn more about AWST on Wikipedia

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

About Perth

Wikipedia

Perth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.

Population:2.1 million

Metro:2.2 million

Business Hours:9:00 AM - 5:00 PM AWST

Currency:AUD (A$)

Stock Exchange:ASX (via Sydney)

Key Landmarks

Kings ParkPerth MintElizabeth QuayCottesloe BeachFremantle Prison

Did You Know?

Western Australia does not observe daylight saving time.

Learn more about AWST timezone →

Understanding the -7h Gap: Perth vs Ireland

Perth runs on Australian Western Standard Time (AWST) at UTC+08:00. Ireland runs on Irish Standard Time (IST) at UTC+01:00, also currently on daylight saving time. That puts Perth 7 hours behind Ireland — a difference of -7h at the current offsets.

In practice, when it is 9:00 AM in Perth it is 2:00 AM in Ireland. Midnight in Perth is 5:00 PM in Ireland.Ireland observes daylight saving time while Perth does not, so the gap narrows or widens by an hour part of the year.

Perth to Ireland time conversion table

Perth (AWST)	Ireland (IST)	Day
12:00 AM	5:00 PM	previous day
6:00 AM	11:00 PM	previous day
7:00 AM	12:00 AM	same day
8:00 AM	1:00 AM	same day
9:00 AM	2:00 AM	same day
12:00 PM	5:00 AM	same day
3:00 PM	8:00 AM	same day
5:00 PM	10:00 AM	same day
6:00 PM	11:00 AM	same day
9:00 PM	2:00 PM	same day

Why people convert Perth to Ireland time

Scheduling a call from Perth to Ireland: a 10:00 AM start in Perth lands at 3:00 AM in Ireland, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Perth and Ireland are inside the 9-to-5 working day between 4:00 PM and 5:00 PM AWST time (9:00 AM–10:00 AM IST). That is roughly 1 hours of usable overlap.
Coordinating a Perth-based team with Ireland contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM AWST" is unambiguous; "3 PM" across a -7h gap is not.
Block 4:00 PM–5:00 PM AWST as the recurring meeting window if you work primarily from Perth and need Ireland colleagues present.
Ireland: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.

About AWST (Australian Western Standard Time)

Australian Western Standard Time (AWST) is used in Western Australia. WA does not observe daylight saving time, having rejected it in multiple referendums. Perth is the most remote major city in the world.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

Best time to call between Perth and Ireland

Both Perth and Ireland sit inside the 9 AM – 5 PM working day between 4:00 PM–5:00 PM AWST, which is 9:00 AM–10:00 AM IST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Perth and Ireland overlap for only 60 minutes (4:00 PM–5:00 PM AWST), so meetings have to be booked precisely.

Perth is 7 hours behind Ireland (AWST UTC+08:00 → IST UTC+01:00). The shared working window is 4:00 PM–5:00 PM AWST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Perth

Does not observe DST

Ireland

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Perth and Ireland?

Perth (AWST, UTC+08:00) is 7 hours behind Ireland (IST, UTC+01:00). The gap is currently -7h.

How do I convert Perth time to Ireland time?

Add -7h to Perth local time. For example, 9:00 AM in Perth is 2:00 AM in Ireland.

What time is it in Ireland right now?

Ireland uses IST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h offset from Perth.

What is the best time to call Ireland from Perth?

Call between 4:00 PM and 5:00 PM AWST — that maps to 9:00 AM–10:00 AM IST and keeps both parties inside the working day.

Which is behind, Perth or Ireland?

Perth is 7 hours behind Ireland. When it is 12:00 PM in Perth it is 5:00 AM in Ireland.

Do Perth and Ireland use different time zones?

Perth (Australia) uses AWST at UTC+08:00, while Ireland (Ireland) uses IST at UTC+01:00. The IANA identifiers are Australia/Perth and Europe/Dublin.

Does daylight saving time affect the Perth–Ireland difference?

Yes at the moment: Ireland is on daylight saving time and Perth is not, so the -7h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Perth's time zone?

AWST also covers Perth, Mandurah, Bunbury, Geraldton.

Which countries use AWST, Perth's zone?

AWST is used in Australia (Western Australia).

Is there a day difference between Perth and Ireland?

Not normally. The -7h gap only pushes the date over the previous day.

What is the time difference between Perth and Ireland?

Ireland is -7h from Perth.

What timezone is Perth in?

Perth operates on Australian Western Time (AWST), UTC+8 with no daylight saving. As Australia's mining capital, Perth coordinates with Asian markets.

What timezone is Ireland in?

Ireland operates on its local timezone.

What are the business hours in Perth?

Standard business hours in Perth are 9:00 AM - 5:00 PM AWST.

Which countries use AWST (Australian Western Standard Time)?

AWST is used in Australia (Western Australia).

Does AWST observe daylight saving time?

No, AWST does not observe daylight saving time and remains at UTC+08:00 year-round.

What are some interesting facts about AWST?

Western Australia does not observe daylight saving time. Perth is the most isolated major city in the world.

Which cities are in the GMT timezone?

Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.

What is the UTC offset for GMT?

Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.

What should I know about the GMT timezone?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.