Offset
The time difference between Colombia Time and Atlantic Time is 2 hours.
Colombia Time (COT) is behind Atlantic Time (ADT).
COT: UTC-5
ADT: UTC-3
Atlantic Time is currently observing daylight saving time; Colombia Time is not.
When to schedule
Business-hours overlap: 9 AM–3 PM in Colombia Time (11 AM–5 PM in Atlantic Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 12:00 PM Colombia Time (2:00 PM Atlantic Time).
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
Canada
- New Year's DayThu, Jan 1
- Good FridayFri, Apr 3
- Victoria DayMon, May 18
- Canada DayWed, Jul 1
- Labour DayMon, Sep 7
- National Day for Truth and ReconciliationWed, Sep 30
- ThanksgivingMon, Oct 12
- Christmas DayFri, Dec 25
About these zones
Colombia Time is also known as COT. To call Colombia, dial +57.
Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.
Atlantic Time is approximately 2,850 miles north of Colombia Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| COT | AST-ATLANTIC | Day |
|---|---|---|
| 12:00 am | 2:00 am | Same day |
| 1:00 am | 3:00 am | Same day |
| 2:00 am | 4:00 am | Same day |
| 3:00 am | 5:00 am | Same day |
| 4:00 am | 6:00 am | Same day |
| 5:00 am | 7:00 am | Same day |
| 6:00 am | 8:00 am | Same day |
| 7:00 am | 9:00 am | Same day |
| 8:00 am | 10:00 am | Same day |
| 9:00 am | 11:00 am | Same day |
| 10:00 am | 12:00 pm | Same day |
| 11:00 am | 1:00 pm | Same day |
| 12:00 pm | 2:00 pm | Same day |
| 1:00 pm | 3:00 pm | Same day |
| 2:00 pm | 4:00 pm | Same day |
| 3:00 pm | 5:00 pm | Same day |
| 4:00 pm | 6:00 pm | Same day |
| 5:00 pm | 7:00 pm | Same day |
| 6:00 pm | 8:00 pm | Same day |
| 7:00 pm | 9:00 pm | Same day |
| 8:00 pm | 10:00 pm | Same day |
| 9:00 pm | 11:00 pm | Same day |
| 10:00 pm | 12:00 am | +1 day |
| 11:00 pm | 1:00 am | +1 day |
Daylight saving time
Atlantic Time observes daylight saving time; Colombia Time does not. The offset between the two zones changes when Atlantic Time transitions: on Sunday, November 1, 2026, clocks fall back from ADT to AST.
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
- 5:31 AM
- Sunset
- 8:56 PM
- Day length
- 15h 25m
Cities in these zones
Cities in Colombia Time
Cities in Atlantic 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 Atlantic Time
- YHZ
Related conversions
Common conversions
- What is 9:00 am COT in AST-ATLANTIC?
- 9:00 am COT is 11:00 am AST-ATLANTIC.
- What is 12:00 pm COT in AST-ATLANTIC?
- 12:00 pm COT is 2:00 pm AST-ATLANTIC.
- What is 12:30 pm COT in AST-ATLANTIC?
- 12:30 pm COT is 2:30 pm AST-ATLANTIC.
- What is 2:00 pm COT in AST-ATLANTIC?
- 2:00 pm COT is 4:00 pm AST-ATLANTIC.
- What is 5:00 pm COT in AST-ATLANTIC?
- 5:00 pm COT is 7:00 pm AST-ATLANTIC.
- What is 11:30 pm COT in AST-ATLANTIC?
- 11:30 pm COT is 1:30 am AST-ATLANTIC, the next day.