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).

AEST to HST

-20h

AEST

AESTSOURCE

UTC+10:00DST observed

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HST

UTC-10:00

HH04

MM00

(previous day)16:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

AEST

HST

12:00 AM

4:00 AM-1

2:00 AM

6:00 AM-1

4:00 AM

8:00 AM-1

6:00 AM

10:00 AM-1

8:00 AM

12:00 PM-1

10:00 AM

2:00 PM-1

12:00 PM

4:00 PM-1

2:00 PM

6:00 PM-1

4:00 PM

8:00 PM-1

6:00 PM

10:00 PM-1

8:00 PM

12:00 AM

10:00 PM

2:00 AM

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

AEST and HST on the World Map

The map below highlights the AEST (Australian Eastern Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.

AEST Zone

→

HST Zone

Explore all world timezones interactively →

AEST – Australian Eastern Standard Time

UTC+10:00

Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.

Countries in AEST

Australia (NSW, VIC, QLD, TAS, ACT)Papua New Guinea

Major Cities in AEST

SydneyMelbourneBrisbaneCanberraHobartGold Coast

Key Facts about AEST

•Queensland does not observe daylight saving time, staying on AEST year-round.
•Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
•The Australian Securities Exchange (ASX) operates on AEST/AEDT.
•AEST is 15 hours ahead of EST during winter.

Daylight Saving:Yes – switches to AEDT

Learn more about AEST on Wikipedia

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST

United States (Hawaii)

Major Cities in HST

HonoluluHiloKailuaPearl CityKapolei

Key Facts about HST

•Hawaii does not observe daylight saving time.
•HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
•Hawaii is one of only two US states that don't observe DST (the other is Arizona).

Daylight Saving:No – UTC-10:00 year-round

Learn more about HST on Wikipedia

Understanding the -20h Gap: AEST vs HST

AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts AEST 20 hours behind HST — a difference of -20h at the current offsets.

In practice, when it is 9:00 AM in AEST it is 1:00 PM in HST on the previous day. Midnight in AEST is 4:00 AM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

AEST to HST time conversion table

AEST (AEST)	HST (HST)	Day
12:00 AM	4:00 AM	previous day
6:00 AM	10:00 AM	previous day
7:00 AM	11:00 AM	previous day
8:00 AM	12:00 PM	previous day
9:00 AM	1:00 PM	previous day
12:00 PM	4:00 PM	previous day
3:00 PM	7:00 PM	previous day
5:00 PM	9:00 PM	previous day
6:00 PM	10:00 PM	previous day
9:00 PM	1:00 AM	same day

Why people convert AEST to HST time

Scheduling a call from AEST to HST: a 10:00 AM start in AEST lands at 2:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -20h gap: AEST and HST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in HST is 1:00 PM in AEST.
Booking travel or deliveries: tracking HST local time against AEST keeps pickup windows and arrival estimates honest across the -20h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -20h gap is not.
With a -20h gap there is no shared 9-to-5 window, so alternate the early start: one week AEST takes the early slot, the next week HST does.

About AEST (Australian Eastern Standard Time)

Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.

About HST (Hawaii Standard Time)

Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.

Best time to call between AEST and HST

With a -20h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 1:00 PM in AEST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

AEST and HST have no shared working hours because of the -20h gap. Teams need to alternate early starts or rely on asynchronous handovers.

AEST is 20 hours behind HST (AEST UTC+10:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

AEST

❄ Currently in Standard Time

Standard: UTC+10:00 · DST: UTC+11:00

Clocks spring forward on Sat, Oct 3, 2026

HST

Does not observe DST

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 AEST and HST?

AEST (AEST, UTC+10:00) is 20 hours behind HST (HST, UTC-10:00). The gap is currently -20h.

How do I convert AEST time to HST time?

Add -20h to AEST local time. For example, 9:00 AM in AEST is 1:00 PM in HST (previous day).

What time is it in HST right now?

HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -20h offset from AEST.