AST to GST Converter

ADT/AST

Atlantic Daylight Time

GMT -3

AST automatically adjusted to ADT time zone, that is in use

GST

Gulf Standard Time

GMT +4

Time Difference

Atlantic Daylight Time is 7 hours behind Gulf Standard Time
6:00 am06:00 in ADT is 1:00 pm13:00 in GST

AST to GST call time
Best time for a conference call or a meeting is between 8am-10am in AST which corresponds to 4pm-6pm in GST

6:00 am06:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
1:00 pm13:00 Gulf Standard Time (GST). Offset UTC +4:00 hours

6:00 am06:00 ADT / 1:00 pm13:00 GST

ADT	GST
12am (midnight)	7am
1am	8am
2am	9am
3am	10am
4am	11am
5am	12pm (noon)
6am	1pm
7am	2pm
8am	3pm
9am	4pm
10am	5pm
11am	6pm
12pm (noon)	7pm
1pm	8pm
2pm	9pm
3pm	10pm
4pm	11pm
5pm	12am (midnight)
6pm	1am
7pm	2am
8pm	3am
9pm	4am
10pm	5am
11pm	6am
0:00	7:00
1:00	8:00
2:00	9:00
3:00	10:00
4:00	11:00
5:00	12:00
6:00	13:00
7:00	14:00
8:00	15:00
9:00	16:00
10:00	17:00
11:00	18:00
12:00	19:00
13:00	20:00
14:00	21:00
15:00	22:00
16:00	23:00
17:00	0:00
18:00	1:00
19:00	2:00
20:00	3:00
21:00	4:00
22:00	5:00
23:00	6:00

Atlantic Standard Time

Offset: AST is 4 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Antigua & Barbuda, Anguilla, Aruba, Barbados, St Barthelemy, Bermuda, Caribbean NL, Canada, Curaçao, Dominica, Dominican Republic, Grenada, Greenland, Guadeloupe, St Kitts & Nevis, St Lucia, St Martin (French), Martinique, Montserrat, Puerto Rico, St Maarten (Dutch), Trinidad & Tobago, St Vincent, Virgin Islands (UK), Virgin Islands (US)

Principal Cities: The largest city in the AST timezone is Santo Domingo from Dominican Republic with population about 2.202 million people. Other major cities in the area are Santiago de los Caballeros, Santo Domingo Oeste, San Juan, Halifax

French: HNA - Heure Normale de l'Atlantique

Spanish: AST - Tiempo Estándar del Atlántico

AST Time Zone Geo Map — AST timezone map

Daylight Saving: This is a standard time zone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Atlantic Daylight Time (ADT).

End: Atlantic Standard Time (AST) has ended on Sunday, March 9, 2025 at 2:00 am local time and clocks were set one hour forward to Sunday, March 9, 2025, 3:00 am local daylight time instead. Standard time ends annually the on second Sunday of March.

Start: Atlantic Standard Time (AST) starts on Sunday, November 2, 2025 at 2:00 am local time and clocks are set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually the on first Sunday of November.

AST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data

-04 - basic short
-0400 - basic
-04:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers

-0400 - sign character (-) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates four hour and zero minutes time differences to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others

Quebec - Military abbreviation for AST
Q - short form of 'Quebec'

IANA/Olson: Reflects AST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems

America/Anguilla
America/Antigua
America/Aruba
America/Barbados
America/Blanc-Sablon
America/Curacao
America/Dominica
America/Glace_Bay
America/Goose_Bay
America/Grenada
America/Guadeloupe
America/Halifax
America/Kralendijk
America/Lower_Princes
America/Marigot
America/Martinique
America/Moncton
America/Montserrat
America/Port_of_Spain
America/Puerto_Rico
America/Santo_Domingo
America/St_Barthelemy
America/St_Kitts
America/St_Lucia
America/St_Thomas
America/St_Vincent
America/Thule
America/Tortola
America/Virgin
Atlantic/Bermuda
Canada/Atlantic

AST Abbreviation: Several time zones share AST abbreviation and it could refer to these time zones

Atlantic Standard Time - UTC -4
Arabia Standard Time - UTC +3
Azerbaijan Standard Time - UTC +4
Argentina Standard Time - UTC -3
Azores Summer Time - UTC +0
Apia Standard Time - UTC +13

Time zones with the GMT -4 offset:

AST - Atlantic Standard Time
EDT - Eastern Daylight Time
AMT - Amazon Time
BOT - Bolivia Time
CDT - Cuba Daylight Time
CLT - Chile Standard Time
FKT - Falkland Island Time
GYT - Guyana Time
HLV - Hora Legal de Venezuela
PYT - Paraguay Time
Q - Quebec Time Zone
VET - Venezuelan Standard Time

Gulf Standard Time

Offset: GST is 4 hours ahead Greenwich Mean Time (GMT) and is used in Asia

GST Time Zone Geo Map — GST timezone map

GST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data

+04 - basic short
+0400 - basic
+04:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers

+0400 - sign character (+) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates four hour and zero minutes time differences to the east of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others

Delta - Military abbreviation for GST
D - short form of 'Delta'

GST Abbreviation: Several time zones share GST abbreviation and it could refer to these time zones

Gulf Standard Time - UTC +4
Georgia Standard Time - UTC +4

Time zones with the GMT +4 offset:

KUYT - Kuybyshev Time
MSD - Moscow Daylight Time
SAMT - Samara Time
AMT - Armenia Time
AZT - Azerbaijan Time
D - Delta Time Zone
GET - Georgia Standard Time
GST - Gulf Standard Time
MUT - Mauritius Time
RET - Reunion Time
SCT - Seychelles Time