NST to ADT Converter
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
9:30 am09:30 NDT (UTC-2:30), Oct 20, 2026 = 9:00 am09:00 ADT (UTC-3), Oct 20, 2026
NDT is 30 minutes ahead of ADT.
NST and ADT examples
These examples always use NST (UTC-3:30) and ADT (UTC-3). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
NST is 30 minutes behind ADT.
How the time difference changes
For most of the year, NDT is 30 minutes ahead of ADT. From Nov 1, 2026 to Mar 14, 2027, NST is 30 minutes ahead of AST. Briefly around clock changes, NDT is 1 hour and 30 minutes ahead of AST or NST is 30 minutes behind ADT.
For most of the year, working hours of 9:00 am to 6:00 pm in NDT correspond to 8:30 am to 5:30 pm in ADT. At other times of the year, working hours of 9:00 am to 6:00 pm in NST correspond to 8:30 am to 5:30 pm in AST.For most of the year, working hours of 09:00 to 18:00 in NDT correspond to 08:30 to 17:30 in ADT. At other times of the year, working hours of 09:00 to 18:00 in NST correspond to 08:30 to 17:30 in AST.
Compare NST time with ADT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Newfoundland Daylight Time is 30 minutes ahead of Atlantic Daylight Time.
9:30 am09:30 in NDT is 9:00 am09:00 in ADT
NDT to ADT call time
Best time for a conference call or a meeting is between 9:30am-6pm09:30-18:00 in NDT which corresponds to 9am-5:30pm09:00-17:30 in ADT
9:30 am09:30 Newfoundland Daylight Time (NDT). Offset UTC -2:30 hours
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
9:30 am09:30 NDT / 9:00 am09:00 ADT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| NDT | ADT |
|---|---|
| 11:30pm previous day | |
| 12:30am | |
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| 11:30am | |
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| 5:30pm | |
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| 23:30 previous day | |
| 00:30 | |
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| 22:30 |
Newfoundland Standard Time
Offset: NST is 3 hours and 30 minutes behind Greenwich Mean Time (GMT).
Countries using this time zone: Canada
Principal Cities: The largest city in the NST time zone is St. John's in Canada, with about 110,525 people. Other major cities in this time zone include Corner Brook, Grand Falls-Windsor, Gander, Clarenville.
French: HNT - Heure Normale de Terre-Neuve
Today the shaded areas are on UTC−2:30 (NDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Newfoundland Daylight Time (NDT).
End: Newfoundland Standard Time (NST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Newfoundland Standard Time (NST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
See Canada daylight saving time and upcoming clock changes worldwide.
NST representations, usage and related time zones
- -0330 - basic
- -03:30 - extended
- -0330 - sign character (-) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates an offset of three hours and thirty minutes to the west of the zero meridian.
- America/St_Johns
- Canada/Newfoundland
Atlantic Daylight Time
Offset: ADT is 3 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Bermuda, Canada, Greenland
Principal Cities: The largest city in the ADT time zone is Halifax in Canada, with about 471,559 people. Other major cities in this time zone include Sydney, Moncton, Saint John, Fredericton.
French: HAA - Heure Avancée de l'Atlantique
Today all shaded areas are on ADT.
Daylight Saving: Atlantic Daylight Time (ADT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Atlantic Standard Time (AST).
Start: Atlantic Daylight Time (ADT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
End: Atlantic Daylight Time (ADT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
See Canada daylight saving time and upcoming clock changes worldwide.
ADT representations, usage and related time zones
- -03 - basic short
- -0300 - basic
- -03:00 - extended
- -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the west of the zero meridian.
- Papa - Military abbreviation for ADT
- P - short form of 'Papa'
- America/Glace_Bay
- America/Goose_Bay
- America/Halifax
- America/Moncton
- America/Thule
- Atlantic/Bermuda
- Canada/Atlantic
- ADT - Atlantic Daylight Time
- PMT - Pierre & Miquelon Standard Time
- PMST - Pierre & Miquelon Standard Time
- AMST - Amazon Summer Time
- ART - Argentina Time
- BRT - Brasilia Time
- CLST - Chile Summer Time
- FKST - Falkland Islands Summer Time
- FKT - Falkland Islands Time
- GFT - French Guiana Time
- P - Papa Time Zone
- PYST - Paraguay Summer Time
- PYT - Paraguay Time
- SRT - Suriname Time
- UYT - Uruguay Time