World Timezones

GST to AST-ATLANTIC Converter

Compare AST-ATLANTIC to GST instead
Gulf Standard Time8:36 amFri, Jun 5
Gulf Standard TimeGST
Middle East · UTC+4
8:36 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
Atlantic TimeADT
North America · UTC-3
1:36 amFri, Jun 5
5p
6p
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p

Offset

The time difference between Gulf Standard Time and Atlantic Time is 7 hours.

7 hours

Gulf Standard Time (GST) is ahead of Atlantic Time (ADT).

GST: UTC+4

ADT: UTC-3

Atlantic Time is currently observing daylight saving time; Gulf Standard Time is not.

When to schedule

Business-hours overlap: 4 PM–5 PM in Gulf Standard Time (9 AM–10 AM in Atlantic Time).

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

Suggested time: 4:00 PM Gulf Standard Time (9:00 AM 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.

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

Gulf Standard Time is also known as GST. To call United Arab Emirates, dial +971.

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

Atlantic Time is approximately 6,250 miles northwest of Gulf Standard Time.

Quick reference

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

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

Daylight saving time

Atlantic Time observes daylight saving time; Gulf Standard 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

Gulf Standard Time
Sunrise
5:29 AM
Sunset
7:07 PM
Day length
13h 38m
Atlantic Time
Sunrise
5:31 AM
Sunset
8:56 PM
Day length
15h 25m

Daylight overlap: 6h 36m — 12:31 PM–7:07 PM in Gulf Standard Time (5:31 AM–12:07 PM in Atlantic Time). Both locations are in daylight during this window.

Cities in these zones

Cities in Gulf Standard Time

Cities in Atlantic Time

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in Gulf Standard Time

  • DWC
  • DXB
  • SHJ
  • AUH

Airports in Atlantic Time

  • YHZ

Related conversions

Common conversions

What is 9:00 am GST in AST-ATLANTIC?
9:00 am GST is 2:00 am AST-ATLANTIC.
What is 12:00 pm GST in AST-ATLANTIC?
12:00 pm GST is 5:00 am AST-ATLANTIC.
What is 12:30 pm GST in AST-ATLANTIC?
12:30 pm GST is 5:30 am AST-ATLANTIC.
What is 2:00 pm GST in AST-ATLANTIC?
2:00 pm GST is 7:00 am AST-ATLANTIC.
What is 5:00 pm GST in AST-ATLANTIC?
5:00 pm GST is 10:00 am AST-ATLANTIC.
What is 11:30 pm GST in AST-ATLANTIC?
11:30 pm GST is 4:30 pm AST-ATLANTIC.