Sydney to COT
-15hSydney
AESTSOURCECOT
COTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and COT on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and COT (Colombia Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •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.
COT – Colombia Time
UTC-05:00Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.
- •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.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Time Conversion Guide: Sydney to COT
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. COT runs on Colombia Time (COT) at UTC-05:00. That puts Sydney 15 hours behind COT — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 6:00 PM in COT on the previous day. Midnight in Sydney is 9:00 AM in COT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to COT time conversion table
| Sydney (AEST) | COT (COT) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | previous day |
| 6:00 AM | 3:00 PM | previous day |
| 7:00 AM | 4:00 PM | previous day |
| 8:00 AM | 5:00 PM | previous day |
| 9:00 AM | 6:00 PM | previous day |
| 12:00 PM | 9:00 PM | previous day |
| 3:00 PM | 12:00 AM | same day |
| 5:00 PM | 2:00 AM | same day |
| 6:00 PM | 3:00 AM | same day |
| 9:00 PM | 6:00 AM | same day |
Why people convert Sydney to COT time
- Scheduling a call from Sydney to COT: a 10:00 AM start in Sydney lands at 7:00 PM in COT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h gap: Sydney and COT 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 COT is 6:00 PM in Sydney.
- Keeping family and friends in sync: knowing that 8:00 PM in Sydney is 5:00 AM in COT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" 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 Sydney takes the early slot, the next week COT does.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -15h gap.
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 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.
Best time to call between Sydney and COT
With a -15h offset there is no overlap inside a normal 9 AM – 5 PM day. COT opens at 9:00 AM COT, which is 6:00 PM in Sydney, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sydney and COT have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sydney is 15 hours behind COT (AEST UTC+10:00 → COT 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
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
COT
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:
Frequently Asked Questions
What is the time difference between Sydney and COT?
Sydney (AEST, UTC+10:00) is 15 hours behind COT (COT, UTC-05:00). The gap is currently -15h.
How do I convert Sydney time to COT time?
Add -15h to Sydney local time. For example, 9:00 AM in Sydney is 6:00 PM in COT (previous day).
What time is it in COT right now?
COT uses COT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h offset from Sydney.
What is the best time to call COT from Sydney?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in Sydney, which is 10:00 PM in COT.
Which is behind, Sydney or COT?
Sydney is 15 hours behind COT. When it is 12:00 PM in Sydney it is 9:00 PM in COT.
Do Sydney and COT use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while COT uses COT at UTC-05:00. The IANA identifiers are Australia/Sydney and America/Bogota.
Does daylight saving time affect the Sydney–COT difference?
Neither zone observes daylight saving time, so the -15h offset between Sydney and COT is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and COT?
Sometimes. The -15h gap is large enough that 8:00 PM or later in Sydney already falls on the in COT.
What is the time difference between Sydney and COT?
COT is -15h from Sydney.
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.
What timezone is COT in?
COT operates on its local timezone.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting 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.
Which cities are in the COT timezone?
Major cities in the COT timezone include Bogotá, Medellín, Cali, Barranquilla, Cartagena.
What is the UTC offset for COT?
Colombia Time (COT) is at UTC-05:00.
What should I know about the COT timezone?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
When is it midnight in Sydney, what time is it in COT?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -15h later in COT (COT).
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