ADT
Atlantic Daylight Time
GMT -3
ADT is NOT in use by many locations
AST (Atlantic Standard Time) is used instead. Switch to AST time zone or select one of the cities Halifax, Sydney, Dartmouth for automatic timezone change.
NST/NDT
Newfoundland Standard Time
GMT -3
NDT automatically adjusted to NST time zone, that is in use

Time Difference

Atlantic Daylight Time is 0 hours and 30 minutes ahead of Newfoundland Standard Time
So 8:30 am08:30 in ADT is 8:00 am08:00 in NST

8:30 am08:30 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
8:00 am08:00 Newfoundland Standard Time (NST). Offset UTC -3:30 hours

8:30 am08:30 ADT / 8:00 am08:00 NST

ADT NST
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

Atlantic Daylight Time

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

Countries: It is used in following countries: Bermuda, Canada, Greenland

Principal Cities: The largest city in the ADT timezone is Halifax from Canada with population about 359111 people. Other major cities in the area are Sydney, Dartmouth, Saint John, Moncton

Daylight Saving: Atlantic Daylight Time (ADT) is a daylight saving/summer timezone, however during winter some places adjust time for one hour back and observe Atlantic Standard Time (AST).

End: ADT ends annually on the same date and time. and clocks were set one hour back on Sunday, November 3, 2019, at 2:00 (2:00 am) local time.

Start: ADT starts annually on the same date and time. and clocks are set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

French: HAA - Heure Avancée de l'Atlantique

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

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -03 - basic short
  • -0300 - basic
  • -03:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates three 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
  • Papa - Military abbreviation for ADT
  • P - short form of 'Papa'

IANA/Olson: Reflects ADT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Glace_Bay
  • America/Goose_Bay
  • America/Halifax
  • America/Moncton
  • America/Thule
  • Atlantic/Bermuda
  • Canada/Atlantic

Time zones with the GMT -3 offset:

  • ADT - Atlantic Daylight Time
  • PMT - Pierre & Miquelon Standard Time
  • PMST - Pierre & Miquelon Standard Time
  • WGT - West Greenland Time
  • AMST - Amazon Summer Time
  • ART - Argentina Time
  • BRT - Brasília time
  • CLST - Chile Summer Time
  • FKST - Falkland Islands Summer Time
  • GFT - French Guiana Time
  • P - Papa Time Zone
  • PYST - Paraguay Summer Time
  • SRT - Suriname Time
  • UYT - Uruguay Time
  • -03 -
  • -02 -


Newfoundland Daylight Time

Offset: NDT is 2 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 NDT timezone is St Johns from Canada with population about 99182 people. Other major cities in the area are Mount Pearl, Corner Brook, Conception Bay South

Daylight Saving: Newfoundland Daylight Time (NDT) is a daylight saving/summer timezone, however during winter some places adjust time for one hour back and observe Newfoundland Standard Time (NST).

End: NDT ends annually on the same date and time. and clocks were set one hour back on Sunday, November 3, 2019, at 2:00 (2:00 am) local time.

Start: NDT starts annually on the same date and time. and clocks are set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

French: HAT - Heure Avancée de Terre-Neuve

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

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -0230 - basic
  • -02:30 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0230 - sign character (-) followed by a four digit time providing hours (02) and minutes (30) of the offset. Indicates two hour and thirty minutes time differences to the west of the zero meridian.

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