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).

ACST to EST

-14h 30m

ACST

ACSTSOURCE

UTC+09:30DST observed

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

EST

UTC-04:00☀ DST active

HH09

MM30

(previous day)21:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

ACST

EST

12:00 AM

10:30 AM-1

2:00 AM

12:30 PM-1

4:00 AM

2:30 PM-1

6:00 AM

4:30 PM-1

8:00 AM

6:30 PM-1

10:00 AM

8:30 PM-1

12:00 PM

10:30 PM-1

2:00 PM

12:30 AM

4:00 PM

2:30 AM

6:00 PM

4:30 AM

8:00 PM

6:30 AM

10:00 PM

8:30 AM

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

ACST and EST on the World Map

The map below highlights the ACST (Australian Central Standard Time) and EST (Eastern Standard Time) timezone regions across the globe.

ACST Zone

→

EST Zone

Explore all world timezones interactively →

ACST – Australian Central Standard Time

UTC+09:30

Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.

Countries in ACST

Australia (South Australia, Northern Territory)

Major Cities in ACST

AdelaideDarwinAlice SpringsMount Gambier

Key Facts about ACST

•ACST uses a half-hour offset: UTC+09:30.
•South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
•Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
•Adelaide is one of the few major cities on a 30-minute offset.

Daylight Saving:Yes – switches to ACDT

Learn more about ACST on Wikipedia

EST – Eastern Standard Time

UTC-05:00

Eastern Standard Time (EST) is the time zone for the eastern United States and Canada, 5 hours behind UTC.

Countries in EST

United States (Eastern)Canada (Ontario, Quebec)Mexico (Quintana Roo)PanamaJamaicaCayman IslandsHaitiBahamasTurks and CaicosColombiaPeruEcuador

Major Cities in EST

New York CityWashington D.C.MiamiTorontoPhiladelphiaAtlantaBostonMontrealDetroitCharlotteIndianapolisOttawaTampaOrlandoClevelandPittsburgh

Key Facts about EST

•EST is the most widely used time zone in the United States by population.
•The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
•23 US states are fully or partially in the Eastern Time Zone.
•EST was established by the Standard Time Act of 1918.
•Over 47% of the US population lives in the Eastern Time Zone.

Daylight Saving:Yes – switches to EDT

Learn more about EST on Wikipedia

Comparing Time Zones: ACST and EST

ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. EST runs on Eastern Standard Time (EST) at UTC-05:00. That puts ACST 14 hours 30 minutes behind EST — a difference of -14h 30m at the current offsets.

In practice, when it is 9:00 AM in ACST it is 6:30 PM in EST on the previous day. Midnight in ACST is 9:30 AM in EST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

ACST to EST time conversion table

ACST (ACST)	EST (EST)	Day
12:00 AM	9:30 AM	previous day
6:00 AM	3:30 PM	previous day
7:00 AM	4:30 PM	previous day
8:00 AM	5:30 PM	previous day
9:00 AM	6:30 PM	previous day
12:00 PM	9:30 PM	previous day
3:00 PM	12:30 AM	same day
5:00 PM	2:30 AM	same day
6:00 PM	3:30 AM	same day
9:00 PM	6:30 AM	same day

Why people convert ACST to EST time

Scheduling a call from ACST to EST: a 10:00 AM start in ACST lands at 7:30 PM in EST the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -14h 30m gap: ACST and EST 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 EST is 6:30 PM in ACST.
Coordinating a ACST-based team with EST 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 ACST" is unambiguous; "3 PM" across a -14h 30m gap is not.
With a -14h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week ACST takes the early slot, the next week EST does.

About ACST (Australian Central Standard Time)

Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.

About EST (Eastern Standard Time)

Eastern Standard Time (EST) is observed during the winter months in the eastern part of North America. It covers 23 US states and parts of Canada including Ontario and Quebec. EST is the most populous time zone in the United States, home to major financial centers like New York City and global organizations headquartered in Washington D.C. During daylight saving time (March–November), clocks shift to Eastern Daylight Time (EDT, UTC-04:00). The time zone also covers parts of the Caribbean and Central America including Panama, Jamaica, and the Cayman Islands.

Best time to call between ACST and EST

With a -14h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. EST opens at 9:00 AM EST, which is 6:30 PM in ACST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

ACST and EST have no shared working hours because of the -14h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

ACST is 14 hours 30 minutes behind EST (ACST UTC+09:30 → EST UTC-05:00). 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

ACST

❄ Currently in Standard Time

Standard: UTC+09:30 · DST: UTC+10:30

Clocks spring forward on Sat, Oct 3, 2026

EST

☀ Currently in DST

Standard: UTC-05:00 · DST: UTC-04:00

Clocks fall back on Sun, Nov 1, 2026

⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.

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 ACST and EST?

ACST (ACST, UTC+09:30) is 14 hours 30 minutes behind EST (EST, UTC-05:00). The gap is currently -14h 30m.

How do I convert ACST time to EST time?

Add -14h 30m to ACST local time. For example, 9:00 AM in ACST is 6:30 PM in EST (previous day).

What time is it in EST right now?

EST uses EST at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -14h 30m offset from ACST.

What is the best time to call EST from ACST?

There is no shared working-hours window because of the -14h 30m gap. The closest option is 1:00 PM in ACST, which is 10:30 PM in EST.

Which is behind, ACST or EST?

ACST is 14 hours 30 minutes behind EST. When it is 12:00 PM in ACST it is 9:30 PM in EST.

Does daylight saving time affect the ACST–EST difference?

Neither zone observes daylight saving time, so the -14h 30m offset between ACST and EST is fixed all year.

Which other cities share ACST's time zone?

ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.

Which countries use ACST, ACST's zone?

ACST is used in Australia (South Australia, Northern Territory).

Is there a day difference between ACST and EST?

Sometimes. The -14h 30m gap is large enough that 8:00 PM or later in ACST already falls on the in EST.

What is the time difference between ACST and EST?

EST is -14h 30m from ACST.

What timezone is ACST in?

ACST operates on its local timezone.

What timezone is EST in?

EST operates on its local timezone.

Which countries use ACST (Australian Central Standard Time)?

ACST is used in Australia (South Australia, Northern Territory).

Does ACST observe daylight saving time?

Yes, ACST switches to ACDT during summer months.

What are some interesting facts about ACST?

ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.

Which cities are in the EST timezone?

Major cities in the EST timezone include New York City, Washington D.C., Miami, Toronto, Philadelphia, Atlanta, Boston, Montreal.

What is the UTC offset for EST?

Eastern Standard Time (EST) is at UTC-05:00. During daylight saving time, it shifts to EDT.

What should I know about the EST timezone?

EST is the most widely used time zone in the United States by population. The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.