World Timezones

AST-ATLANTIC to UTC Converter

Compare UTC 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
Coordinated Universal TimeUTC
Global · UTC
4:35 amFri, Jun 5
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a

Offset

The time difference between Atlantic Time and Coordinated Universal Time is 3 hours.

3 hours

Atlantic Time (ADT) is behind Coordinated Universal Time (UTC).

ADT: UTC-3

UTC: UTC

Atlantic Time is currently observing daylight saving time; Coordinated Universal Time is not.

When to schedule

Business-hours overlap: 9 AM–2 PM in Atlantic Time (12 PM–5 PM in Coordinated Universal Time).

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

Suggested time: 11:00 AM Atlantic Time (2:00 PM Coordinated Universal 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

About these zones

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

Coordinated Universal Time is also known as UTC.

Coordinated Universal Time is approximately 4,950 miles east of Atlantic Time.

Quick reference

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

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

Daylight saving time

Atlantic Time observes daylight saving time; Coordinated Universal 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
Coordinated Universal Time
Sunrise
5:56 AM
Sunset
6:03 PM
Day length
12h 7m

Daylight overlap: 9h 32m — 5:31 AM–3:03 PM in Atlantic Time (8:31 AM–6:03 PM in Coordinated Universal Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Atlantic Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Atlantic Time

  • YHZ

Related conversions

Common conversions

What is 9:00 am AST-ATLANTIC in UTC?
9:00 am AST-ATLANTIC is 12:00 pm UTC.
What is 12:00 pm AST-ATLANTIC in UTC?
12:00 pm AST-ATLANTIC is 3:00 pm UTC.
What is 12:30 pm AST-ATLANTIC in UTC?
12:30 pm AST-ATLANTIC is 3:30 pm UTC.
What is 2:00 pm AST-ATLANTIC in UTC?
2:00 pm AST-ATLANTIC is 5:00 pm UTC.
What is 5:00 pm AST-ATLANTIC in UTC?
5:00 pm AST-ATLANTIC is 8:00 pm UTC.
What is 11:30 pm AST-ATLANTIC in UTC?
11:30 pm AST-ATLANTIC is 2:30 am UTC, the next day.