Offset
The time difference between Colombia Time and Australian Central Time is 14.5 hours.
Colombia Time (COT) is behind Australian Central Time (ACST).
COT: UTC-5
ACST: UTC+9:30
Neither Colombia Time nor Australian Central Time is currently observing daylight saving time.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Colombia Time and Australian Central Time don't overlap on the same weekday. Australian Central Time is 15 hours ahead of Colombia Time.
With some flexibility, there’s a workable window outside standard hours:
- 5 PM–8 PM in Colombia Time (7 AM–10 AM the next day in Australian Central Time) — suggest 6:00 PM Colombia Time (8:30 AM Australian Central Time).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Colombia
- New Year's DayThu, Jan 1
- EpiphanyMon, Jan 12
- Saint Joseph's DayMon, Mar 23
- Maundy ThursdayThu, Apr 2
- Good FridayFri, Apr 3
- Labour DayFri, May 1
- Ascension DayMon, May 18
- Corpus ChristiMon, Jun 8
- Sacred HeartMon, Jun 15
- Saint Peter and Saint PaulMon, Jun 29
- Declaration of IndependenceMon, Jul 20
- Battle of BoyacáFri, Aug 7
- Assumption of MaryMon, Aug 17
- Columbus DayMon, Oct 12
- All Saints’ DayMon, Nov 2
- Independence of CartagenaMon, Nov 16
- Immaculate ConceptionTue, Dec 8
- Christmas DayFri, Dec 25
Australia
- New Year's DayThu, Jan 1
- Australia DayMon, Jan 26
- Good FridayFri, Apr 3
- Easter MondayMon, Apr 6
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
Colombia Time is also known as COT. To call Colombia, dial +57.
Australian Central Time is also known as ACST, or ACDT. To call Australia, dial +61.
Australian Central Time is approximately 9,500 miles southwest of Colombia Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| COT | ACST | Day |
|---|---|---|
| 12:00 am | 2:30 pm | Same day |
| 1:00 am | 3:30 pm | Same day |
| 2:00 am | 4:30 pm | Same day |
| 3:00 am | 5:30 pm | Same day |
| 4:00 am | 6:30 pm | Same day |
| 5:00 am | 7:30 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 |
| 10:00 am | 12:30 am | +1 day |
| 11:00 am | 1:30 am | +1 day |
| 12:00 pm | 2:30 am | +1 day |
| 1:00 pm | 3:30 am | +1 day |
| 2:00 pm | 4:30 am | +1 day |
| 3:00 pm | 5:30 am | +1 day |
| 4:00 pm | 6:30 am | +1 day |
| 5:00 pm | 7:30 am | +1 day |
| 6:00 pm | 8:30 am | +1 day |
| 7:00 pm | 9:30 am | +1 day |
| 8:00 pm | 10:30 am | +1 day |
| 9:00 pm | 11:30 am | +1 day |
| 10:00 pm | 12:30 pm | +1 day |
| 11:00 pm | 1:30 pm | +1 day |
Daylight saving time
Australian Central Time observes daylight saving time; Colombia Time does not. The offset between the two zones changes when Australian Central Time transitions: on Sunday, October 4, 2026, clocks spring forward from ACST to ACDT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:44 AM
- Sunset
- 6:07 PM
- Day length
- 12h 23m
- Sunrise
- 7:18 AM
- Sunset
- 5:12 PM
- Day length
- 9h 55m
Daylight overlap: 1h 19m — 4:48 PM–6:07 PM in Colombia Time (7:18 AM–8:37 AM in Australian Central Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Colombia Time
Cities in Australian Central Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Colombia Time
- BOG
- CLO
- EOH
- MDE
Airports in Australian Central Time
- ADL
Related conversions
Common conversions
- What is 9:00 am COT in ACST?
- 9:00 am COT is 11:30 pm ACST.
- What is 12:00 pm COT in ACST?
- 12:00 pm COT is 2:30 am ACST, the next day.
- What is 12:30 pm COT in ACST?
- 12:30 pm COT is 3:00 am ACST, the next day.
- What is 2:00 pm COT in ACST?
- 2:00 pm COT is 4:30 am ACST, the next day.
- What is 5:00 pm COT in ACST?
- 5:00 pm COT is 7:30 am ACST, the next day.
- What is 11:30 pm COT in ACST?
- 11:30 pm COT is 2:00 pm ACST, the next day.