AMST to ADT Converter
AMST is not used on this date.
This converter uses AMT (UTC−4), as in Cuiaba.
Quick answers
Selected conversion
8:00 am08:00 AMT (UTC-4), Oct 10, 2026 = 9:00 am09:00 ADT (UTC-3), Oct 10, 2026
AMT is 1 hour behind ADT.
AMST and ADT examples
These examples always use AMST (UTC-3) 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.
AMST and ADT have the same local time.
How the time difference changes
For most of the year, AMT is 1 hour behind ADT. At other times of the year, AMT and AST have the same time.
For most of the year, working hours of 9:00 am to 5:00 pm in AMT correspond to 10:00 am to 6:00 pm in ADT. At other times of the year, working hours of 9:00 am to 5:00 pm in AMT correspond to 9:00 am to 5:00 pm in AST.For most of the year, working hours of 09:00 to 17:00 in AMT correspond to 10:00 to 18:00 in ADT. At other times of the year, working hours of 09:00 to 17:00 in AMT correspond to 09:00 to 17:00 in AST.
Compare AMST time with ADT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Amazon Time is 1 hour behind Atlantic Daylight Time.
8:00 am08:00 in AMT is 9:00 am09:00 in ADT
AMT to ADT call time
Best time for a conference call or a meeting is between 9am-4pm09:00-16:00 in AMT which corresponds to 10am-5pm10:00-17:00 in ADT
8:00 am08:00 Amazon Time (AMT). Offset UTC -4:00 hours
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
8:00 am08:00 AMT / 9:00 am09:00 ADT
| AMT | ADT |
|---|---|
| 12:00am | 1:00am |
| 1:00am | 2:00am |
| 2:00am | 3:00am |
| 3:00am | 4:00am |
| 4:00am | 5:00am |
| 5:00am | 6:00am |
| 6:00am | 7:00am |
| 7:00am | 8:00am |
| 8:00am | 9:00am |
| 9:00am | 10:00am |
| 10:00am | 11:00am |
| 11:00am | 12:00pm |
| 12:00pm | 1:00pm |
| 1:00pm | 2:00pm |
| 2:00pm | 3:00pm |
| 3:00pm | 4:00pm |
| 4:00pm | 5:00pm |
| 5:00pm | 6:00pm |
| 6:00pm | 7:00pm |
| 7:00pm | 8:00pm |
| 8:00pm | 9:00pm |
| 9:00pm | 10:00pm |
| 10:00pm | 11:00pm |
| 11:00pm | 12:00am |
| 00:00 | 01:00 |
| 01:00 | 02:00 |
| 02:00 | 03:00 |
| 03:00 | 04:00 |
| 04:00 | 05:00 |
| 05:00 | 06:00 |
| 06:00 | 07:00 |
| 07:00 | 08:00 |
| 08:00 | 09:00 |
| 09:00 | 10:00 |
| 10:00 | 11:00 |
| 11:00 | 12:00 |
| 12:00 | 13:00 |
| 13:00 | 14:00 |
| 14:00 | 15:00 |
| 15:00 | 16:00 |
| 16:00 | 17:00 |
| 17:00 | 18:00 |
| 18:00 | 19:00 |
| 19:00 | 20:00 |
| 20:00 | 21:00 |
| 21:00 | 22:00 |
| 22:00 | 23:00 |
| 23:00 | 00:00 |
Amazon Summer Time
Offset: AMST is 3 hours behind Greenwich Mean Time (GMT) and is used in South America
AMST 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 AMST
- P - short form of 'Papa'
- Armenia Summer Time - UTC +5
- Amazon Summer Time - UTC -3
- ADT - Atlantic Daylight Time
- PMT - Pierre & Miquelon Standard Time
- PMST - Pierre & Miquelon Standard 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
Atlantic Daylight Time
Offset: ADT is 3 hours behind Greenwich Mean Time (GMT) and is used in North America
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, Dartmouth, Moncton, Saint John.
French: HAA - Heure Avancée de l'Atlantique
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.
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 - 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