World Timezones

AST-ATLANTIC to COT Converter

Compare COT to AST-ATLANTIC instead
Atlantic Time1:35 amFri, Jun 5
Atlantic TimeADT
North America · UTC-3
1:35 amFri, Jun 5
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Colombia TimeCOT
South America · UTC-5
11:35 pmThu, Jun 4
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p

Offset

The time difference between Atlantic Time and Colombia Time is 2 hours.

2 hours

Atlantic Time (ADT) is ahead of Colombia Time (COT).

ADT: UTC-3

COT: UTC-5

Atlantic Time is currently observing daylight saving time; Colombia Time is not.

When to schedule

Business-hours overlap: 11 AM–5 PM in Atlantic Time (9 AM–3 PM in Colombia Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 2:00 PM Atlantic Time (12:00 PM Colombia 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.

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

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

About these zones

Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.

Colombia Time is also known as COT. To call Colombia, dial +57.

Colombia Time is approximately 2,850 miles south of Atlantic Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

AST-ATLANTICCOTDay
12:00 am10:00 pm-1 day
1:00 am11:00 pm-1 day
2:00 am12:00 amSame day
3:00 am1:00 amSame day
4:00 am2:00 amSame day
5:00 am3:00 amSame day
6:00 am4:00 amSame day
7:00 am5:00 amSame day
8:00 am6:00 amSame day
9:00 am7:00 amSame day
10:00 am8:00 amSame day
11:00 am9:00 amSame day
12:00 pm10:00 amSame day
1:00 pm11:00 amSame day
2:00 pm12:00 pmSame day
3:00 pm1:00 pmSame day
4:00 pm2:00 pmSame day
5:00 pm3:00 pmSame day
6:00 pm4:00 pmSame day
7:00 pm5:00 pmSame day
8:00 pm6:00 pmSame day
9:00 pm7:00 pmSame day
10:00 pm8:00 pmSame day
11:00 pm9:00 pmSame 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

Atlantic Time
Sunrise
5:31 AM
Sunset
8:56 PM
Day length
15h 25m
Colombia Time
Sunrise
5:44 AM
Sunset
6:07 PM
Day length
12h 23m

Cities in these zones

Cities in Atlantic Time

Cities in Colombia Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Atlantic Time

  • YHZ

Airports in Colombia Time

  • BOG
  • CLO
  • EOH
  • MDE

Related conversions

Common conversions

What is 9:00 am AST-ATLANTIC in COT?
9:00 am AST-ATLANTIC is 7:00 am COT.
What is 12:00 pm AST-ATLANTIC in COT?
12:00 pm AST-ATLANTIC is 10:00 am COT.
What is 12:30 pm AST-ATLANTIC in COT?
12:30 pm AST-ATLANTIC is 10:30 am COT.
What is 2:00 pm AST-ATLANTIC in COT?
2:00 pm AST-ATLANTIC is 12:00 pm COT.
What is 5:00 pm AST-ATLANTIC in COT?
5:00 pm AST-ATLANTIC is 3:00 pm COT.
What is 11:30 pm AST-ATLANTIC in COT?
11:30 pm AST-ATLANTIC is 9:30 pm COT.