Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

COT to Sydney

+15h

COT

COTSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Sydney

AEST

Australia · UTC+10:00DST observed

HH03

MM00

(next day)03:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

COT

Sydney

12:00 AM

3:00 PM

2:00 AM

5:00 PM

4:00 AM

7:00 PM

6:00 AM

9:00 PM

8:00 AM

11:00 PM

10:00 AM

1:00 AM+1

12:00 PM

3:00 AM+1

2:00 PM

5:00 AM+1

4:00 PM

7:00 AM+1

6:00 PM

9:00 AM+1

8:00 PM

11:00 AM+1

10:00 PM

1:00 PM+1

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

COT and AEST on the World Map

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

COT Zone

→

AEST Zone

Explore all world timezones interactively →

COT – Colombia Time

UTC-05:00

Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.

Countries in COT

Colombia

Major Cities in COT

BogotáMedellínCaliBarranquillaCartagena

Key Facts about COT

•Colombia does not observe daylight saving time.
•COT is the same offset as EST (UTC-05:00).
•Bogotá sits at 2,640m elevation, making it one of the highest capital cities.

Daylight Saving:No – UTC-05:00 year-round

Learn more about COT on Wikipedia

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

About Sydney

Wikipedia

Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.

Population:5.4 million

Metro:5.4 million

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

Currency:AUD (A$)

Stock Exchange:ASX (Australian Securities Exchange)

Key Landmarks

Sydney Opera HouseSydney Harbour BridgeBondi BeachDarling HarbourRoyal Botanic Garden

Did You Know?

Sydney is one of the first major cities to welcome the New Year.

Learn more about AEST timezone →

Understanding the +15h Gap: COT vs Sydney

COT runs on Colombia Time (COT) at UTC-05:00. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts COT 15 hours ahead of Sydney — a difference of +15h at the current offsets.

In practice, when it is 9:00 AM in COT it is 12:00 AM in Sydney on the next day. Midnight in COT is 3:00 PM in Sydney. Neither zone observes daylight saving time, so the offset between them stays constant all year.

COT to Sydney time conversion table

COT (COT)	Sydney (AEST)	Day
12:00 AM	3:00 PM	same day
6:00 AM	9:00 PM	same day
7:00 AM	10:00 PM	same day
8:00 AM	11:00 PM	same day
9:00 AM	12:00 AM	next day
12:00 PM	3:00 AM	next day
3:00 PM	6:00 AM	next day
5:00 PM	8:00 AM	next day
6:00 PM	9:00 AM	next day
9:00 PM	12:00 PM	next day

Why people convert COT to Sydney time

Scheduling a call from COT to Sydney: a 10:00 AM start in COT lands at 1:00 AM in Sydney the next day, so you can confirm the slot without doing the arithmetic yourself.
Handling a +15h gap: COT and Sydney 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 Sydney is 12:00 AM in COT.
Coordinating a COT-based team with Sydney 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 COT" is unambiguous; "3 PM" across a +15h gap is not.
With a +15h gap there is no shared 9-to-5 window, so alternate the early start: one week COT takes the early slot, the next week Sydney does.
Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.

About COT (Colombia Time)

Colombia Time (COT) is used throughout Colombia. Colombia does not observe daylight saving time. COT shares the same offset as EST (UTC-05:00). Bogotá, the capital, is one of the largest cities in South America.

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.

Best time to call between COT and Sydney

With a +15h offset there is no overlap inside a normal 9 AM – 5 PM day. Sydney opens at 9:00 AM AEST, which is 12:00 AM in COT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

COT and Sydney have no shared working hours because of the +15h gap. Teams need to alternate early starts or rely on asynchronous handovers.

COT is 15 hours ahead of Sydney (COT UTC-05:00 → AEST 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

COT

Does not observe DST

Sydney

❄ Currently in Standard Time

Standard: UTC+10:00 · DST: UTC+11:00

Clocks spring forward on Sat, Oct 3, 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 COT and Sydney?

COT (COT, UTC-05:00) is 15 hours ahead of Sydney (AEST, UTC+10:00). The gap is currently +15h.

How do I convert COT time to Sydney time?

Add +15h to COT local time. For example, 9:00 AM in COT is 12:00 AM in Sydney (next day).

What time is it in Sydney right now?

Sydney uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +15h offset from COT.

What is the best time to call Sydney from COT?

There is no shared working-hours window because of the +15h gap. The closest option is 1:00 PM in COT, which is 4:00 AM in Sydney.

Which is ahead, COT or Sydney?

COT is 15 hours ahead of Sydney. When it is 12:00 PM in COT it is 3:00 AM in Sydney.

Do COT and Sydney use different time zones?

COT uses COT at UTC-05:00, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are America/Bogota and Australia/Sydney.

Does daylight saving time affect the COT–Sydney difference?

Neither zone observes daylight saving time, so the +15h offset between COT and Sydney is fixed all year.

Which other cities share COT's time zone?

COT also covers Bogotá, Medellín, Cali, Barranquilla, Cartagena.

Which countries use COT, COT's zone?

COT is used in Colombia.

Is there a day difference between COT and Sydney?

Sometimes. The +15h gap is large enough that 8:00 PM or later in COT already falls on the next day in Sydney.

What is the time difference between COT and Sydney?

Sydney is +15h from COT.

What timezone is COT in?

COT operates on its local timezone.

What timezone is Sydney in?

Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.