COT to ACST
+14h 30mCOT
COTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
COT and ACST on the World Map
The map below highlights the COT (Colombia Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
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.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •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.
COT to ACST Time Difference – Complete Guide
COT runs on Colombia Time (COT) at UTC-05:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts COT 14 hours 30 minutes ahead of ACST — a difference of +14h 30m at the current offsets.
In practice, when it is 9:00 AM in COT it is 11:30 PM in ACST. Midnight in COT is 2:30 PM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
COT to ACST time conversion table
| COT (COT) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 2:30 PM | same day |
| 6:00 AM | 8:30 PM | same day |
| 7:00 AM | 9:30 PM | same day |
| 8:00 AM | 10:30 PM | same day |
| 9:00 AM | 11:30 PM | same day |
| 12:00 PM | 2:30 AM | next day |
| 3:00 PM | 5:30 AM | next day |
| 5:00 PM | 7:30 AM | next day |
| 6:00 PM | 8:30 AM | next day |
| 9:00 PM | 11:30 AM | next day |
Why people convert COT to ACST time
- Scheduling a call from COT to ACST: a 10:00 AM start in COT lands at 12:30 AM in ACST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +14h 30m gap: COT 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 11:30 PM in COT.
- Booking travel or deliveries: tracking ACST local time against COT keeps pickup windows and arrival estimates honest across the +14h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM COT" 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 COT takes the early slot, the next week ACST does.
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 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 COT and ACST
With a +14h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. ACST opens at 9:00 AM ACST, which is 11:30 PM in COT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
COT and ACST have no shared working hours because of the +14h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
COT is 14 hours 30 minutes ahead of ACST (COT UTC-05:00 → 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
COT
Does not observe DST
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
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:
Frequently Asked Questions
What is the time difference between COT and ACST?
COT (COT, UTC-05:00) is 14 hours 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +14h 30m.
How do I convert COT time to ACST time?
Add +14h 30m to COT local time. For example, 9:00 AM in COT is 11:30 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 +14h 30m offset from COT.
What is the best time to call ACST from COT?
There is no shared working-hours window because of the +14h 30m gap. The closest option is 1:00 PM in COT, which is 3:30 AM in ACST.
Which is ahead, COT or ACST?
COT is 14 hours 30 minutes ahead of ACST. When it is 12:00 PM in COT it is 2:30 AM in ACST.
Does daylight saving time affect the COT–ACST difference?
Neither zone observes daylight saving time, so the +14h 30m offset between COT and ACST 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 ACST?
Sometimes. The +14h 30m gap is large enough that 8:00 PM or later in COT already falls on the next day in ACST.
What is the time difference between COT and ACST?
ACST is +14h 30m from COT.
What timezone is COT in?
COT operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use COT (Colombia Time)?
COT is used in Colombia.
Does COT observe daylight saving time?
No, COT does not observe daylight saving time and remains at UTC-05:00 year-round.
What are some interesting facts about COT?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
Which cities are in the ACST timezone?
Major cities in the ACST timezone include Adelaide, Darwin, Alice Springs, Mount Gambier.
What is the UTC offset for ACST?
Australian Central Standard Time (ACST) is at UTC+09:30. During daylight saving time, it shifts to ACDT.
What should I know about the ACST timezone?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
When is it midnight in COT, what time is it in ACST?
When it is 12:00 AM (midnight) in COT (COT), it is +14h 30m later in ACST (ACST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More COT time conversions
- cot to bogota
- cot to colombia
- cot to new york
- cot to london
- cot to dubai
- cot to tokyo
- cot to singapore
- cot to sydney
- cot to los angeles
- cot to paris
- cot to delhi
- cot to mumbai
- cot to berlin
- cot to hong kong
- cot to toronto
- cot to kathmandu
- new york to cot
- london to cot
- dubai to cot
- tokyo to cot
- singapore to cot
- sydney to cot
- los angeles to cot
- paris to cot
- delhi to cot
- mumbai to cot
- berlin to cot
- hong kong to cot
- toronto to cot
- kathmandu to cot
See every conversion from COT →·See every conversion from ACST →