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).

EDT to ACST

+13h 30m

EDT

EDTSOURCE

UTC-04:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

ACST

UTC+09:30DST observed

HH01

MM30

(next day)01:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

EDT

ACST

12:00 AM

1:30 PM

2:00 AM

3:30 PM

4:00 AM

5:30 PM

6:00 AM

7:30 PM

8:00 AM

9:30 PM

10:00 AM

11:30 PM

12:00 PM

1:30 AM+1

2:00 PM

3:30 AM+1

4:00 PM

5:30 AM+1

6:00 PM

7:30 AM+1

8:00 PM

9:30 AM+1

10:00 PM

11:30 AM+1

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

EDT and ACST on the World Map

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

EDT Zone

→

ACST Zone

Explore all world timezones interactively →

EDT – Eastern Daylight Time

UTC-04:00

Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.

Countries in EDT

United States (Eastern)Canada (Ontario, Quebec)BahamasHaitiTurks and Caicos

Major Cities in EDT

New York CityWashington D.C.TorontoMiamiPhiladelphiaAtlantaBostonMontreal

Key Facts about EDT

•EDT is observed from the second Sunday of March to the first Sunday of November.
•During EDT, the US East Coast is only 4 hours behind London (instead of 5).
•Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.

Daylight Saving:Yes – switches to EST

Learn more about EDT on Wikipedia

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

EDT vs ACST: Offsets, DST and Best Call Times

EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts EDT 13 hours 30 minutes ahead of ACST — a difference of +13h 30m at the current offsets.

In practice, when it is 9:00 AM in EDT it is 10:30 PM in ACST. Midnight in EDT is 1:30 PM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

EDT to ACST time conversion table

EDT (EDT)	ACST (ACST)	Day
12:00 AM	1:30 PM	same day
6:00 AM	7:30 PM	same day
7:00 AM	8:30 PM	same day
8:00 AM	9:30 PM	same day
9:00 AM	10:30 PM	same day
12:00 PM	1:30 AM	next day
3:00 PM	4:30 AM	next day
5:00 PM	6:30 AM	next day
6:00 PM	7:30 AM	next day
9:00 PM	10:30 AM	next day

Why people convert EDT to ACST time

Scheduling a call from EDT to ACST: a 10:00 AM start in EDT lands at 11:30 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +13h 30m gap: EDT and ACST 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 ACST is 10:30 PM in EDT.
Coordinating a EDT-based team with ACST 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 EDT" is unambiguous; "3 PM" across a +13h 30m gap is not.
With a +13h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week EDT takes the early slot, the next week ACST does.

About EDT (Eastern Daylight Time)

Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.

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.

Best time to call between EDT and ACST

With a +13h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. ACST opens at 9:00 AM ACST, which is 10:30 PM in EDT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

EDT and ACST have no shared working hours because of the +13h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

EDT is 13 hours 30 minutes ahead of ACST (EDT UTC-04:00 → ACST UTC+09:30). 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

EDT

☀ Currently in DST

Standard: UTC-05:00 · DST: UTC-04:00

Clocks fall back on Sun, Nov 1, 2026

ACST

❄ Currently in Standard Time

Standard: UTC+09:30 · DST: UTC+10:30

Clocks spring forward on Sat, Oct 3, 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 EDT and ACST?

EDT (EDT, UTC-04:00) is 13 hours 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +13h 30m.

How do I convert EDT time to ACST time?

Add +13h 30m to EDT local time. For example, 9:00 AM in EDT is 10:30 PM in ACST.

What time is it in ACST right now?

ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +13h 30m offset from EDT.

What is the best time to call ACST from EDT?

There is no shared working-hours window because of the +13h 30m gap. The closest option is 1:00 PM in EDT, which is 2:30 AM in ACST.

Which is ahead, EDT or ACST?

EDT is 13 hours 30 minutes ahead of ACST. When it is 12:00 PM in EDT it is 1:30 AM in ACST.

Does daylight saving time affect the EDT–ACST difference?

Neither zone observes daylight saving time, so the +13h 30m offset between EDT and ACST is fixed all year.

Which other cities share EDT's time zone?

EDT also covers New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.

Which countries use EDT, EDT's zone?

EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.

Is there a day difference between EDT and ACST?

Sometimes. The +13h 30m gap is large enough that 8:00 PM or later in EDT already falls on the next day in ACST.

What is the time difference between EDT and ACST?

ACST is +13h 30m from EDT.

What timezone is EDT in?

EDT operates on its local timezone.

What timezone is ACST in?

ACST operates on its local timezone.

Which countries use EDT (Eastern Daylight Time)?

EDT is used in United States (Eastern), Canada (Ontario, Quebec), Bahamas, Haiti, Turks and Caicos.

Does EDT observe daylight saving time?

Yes, EDT switches to EST during summer months.

What are some interesting facts about EDT?

EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).