AEST to COT
-15hAEST
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.
Everything You Need to Know About AEST and COT Time
AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. COT runs on Colombia Time (COT) at UTC-05:00. That puts AEST 15 hours behind COT — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in AEST it is 6:00 PM in COT on the previous day. Midnight in AEST is 9:00 AM in COT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AEST to COT time conversion table
| AEST (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 AEST to COT time
- Scheduling a call from AEST to COT: a 10:00 AM start in AEST 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: AEST 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 AEST.
- Coordinating a AEST-based team with COT 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 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 AEST takes the early slot, the next week COT 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 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 AEST 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 AEST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AEST and COT have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AEST 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
AEST
❄ 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 AEST and COT?
AEST (AEST, UTC+10:00) is 15 hours behind COT (COT, UTC-05:00). The gap is currently -15h.
How do I convert AEST time to COT time?
Add -15h to AEST local time. For example, 9:00 AM in AEST 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 AEST.
What is the best time to call COT from AEST?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in AEST, which is 10:00 PM in COT.
Which is behind, AEST or COT?
AEST is 15 hours behind COT. When it is 12:00 PM in AEST it is 9:00 PM in COT.
Does daylight saving time affect the AEST–COT difference?
Neither zone observes daylight saving time, so the -15h offset between AEST and COT is fixed all year.
Which other cities share AEST's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, AEST's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between AEST and COT?
Sometimes. The -15h gap is large enough that 8:00 PM or later in AEST already falls on the in COT.
What is the time difference between AEST and COT?
COT is -15h from AEST.
What timezone is AEST in?
AEST operates on its local timezone.
What timezone is COT in?
COT operates on its local timezone.
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 AEST, what time is it in COT?
When it is 12:00 AM (midnight) in AEST (AEST), it is -15h later in COT (COT).
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See every conversion from AEST →·See every conversion from COT →