NDT/NST
Newfoundland Daylight Time
GMT -2
NST automatically adjusted to NDT time zone, that is in use
ADT/AST
Atlantic Daylight Time
GMT -3
AST automatically adjusted to ADT time zone, that is in use

Time Difference

Newfoundland Daylight Time is 0 hours and 30 minutes ahead of Atlantic Daylight Time
So 12:00 am00:00 in NDT is 11:30 pm23:30 in ADT

12:00 am00:00 Newfoundland Daylight Time (NDT). Offset UTC -2:30 hours
11:30 pm23:30 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours

12:00 am00:00 NDT / 11:30 pm23:30 ADT

NDT ADT
12am (midnight) 11:30 pm
1am 12:30 am
2am 1:30 am
3am 2:30 am
4am 3:30 am
5am 4:30 am
6am 5:30 am
7am 6:30 am
8am 7:30 am
9am 8:30 am
10am 9:30 am
11am 10:30 am
12pm (noon) 11:30 am
1pm 12:30 pm
2pm 1:30 pm
3pm 2:30 pm
4pm 3:30 pm
5pm 4:30 pm
6pm 5:30 pm
7pm 6:30 pm
8pm 7:30 pm
9pm 8:30 pm
10pm 9:30 pm
11pm 10:30 pm
0:00 23:30
1:00 0:30
2:00 1:30
3:00 2:30
4:00 3:30
5:00 4:30
6:00 5:30
7:00 6:30
8:00 7:30
9:00 8:30
10:00 9:30
11:00 10:30
12:00 11:30
13:00 12:30
14:00 13:30
15:00 14:30
16:00 15:30
17:00 16:30
18:00 17:30
19:00 18:30
20:00 19:30
21:00 20:30
22:00 21:30
23:00 22:30

Newfoundland Standard Time

Offset: NST is 3 hours and 30 minutes behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Canada

Principal Cities: The largest city in the NST timezone is St Johns from Canada with population about 99,182 people. Other major cities in the area are Mount Pearl, Corner Brook, Conception Bay South

Daylight Saving: This is a standard timezone, however during summer some places adjust time for one hour forward for daylight saving and observe Newfoundland Daylight Time (NDT).

End: NST ended and clocks were set one hour forward on Sunday, 08 March 2020, at 2:00 (2:00 am) local time.

Start: NST starts and clocks are set one hour back on Sunday, 01 November 2020, at 2:00 (2:00 am) local time.

French: HNT - Heure Normale de Terre-Neuve

NST Time Zone Geo Map
NST timezone map
NST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -0330 - basic
  • -03:30 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0330 - sign character (-) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates three hour and thirty minutes time differences to the west of the zero meridian.

IANA/Olson: Reflects NST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/St_Johns
  • Canada/Newfoundland


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

Daylight Saving: This is a standard timezone, however during summer some places adjust time for one hour forward for daylight saving and observe Atlantic Daylight Time (ADT).

End: AST ended and clocks were set one hour forward on Sunday, 08 March 2020, at 2:00 (2:00 am) local time.

Start: AST starts and clocks are set one hour back on Sunday, 01 November 2020, at 2:00 (2:00 am) local time.

French: HNA - Heure Normale de l'Atlantique

Spanish: AST - Tiempo Estándar del Atlántico

AST Time Zone Geo Map
AST timezone map
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

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
  • PYT - Paraguay Time
  • Q - Quebec Time Zone
  • VET - Venezuelan Standard Time
  • -04 -