Offset
The time difference between Atlantic Time and Singapore Time is 11 hours.
Atlantic Time (ADT) is behind Singapore Time (SGT).
ADT: UTC-3
SGT: UTC+8
Atlantic Time is currently observing daylight saving time; Singapore Time is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Atlantic Time and Singapore Time don't overlap on the same weekday. Singapore Time is 11 hours ahead of Atlantic Time.
With some flexibility, there’s a workable window outside standard hours:
- 7 AM–9 AM in Atlantic Time (6 PM–8 PM in Singapore Time) — suggest 8:00 AM Atlantic Time (7:00 PM Singapore Time).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Canada
- New Year's DayThu, Jan 1
- Good FridayFri, Apr 3
- Victoria DayMon, May 18
- Canada DayWed, Jul 1
- Labour DayMon, Sep 7
- National Day for Truth and ReconciliationWed, Sep 30
- ThanksgivingMon, Oct 12
- Christmas DayFri, Dec 25
Singapore
- New Year's DayThu, Jan 1
- Chinese New YearTue, Feb 17
- Chinese New YearWed, Feb 18
- Hari Raya PuasaFri, Mar 20
- Good FridayFri, Apr 3
- Labour DayFri, May 1
- Hari Raya Haji (Tentative Date)Wed, May 27
- National DayMon, Aug 10
- DeepavaliMon, Nov 9
- Christmas DayFri, Dec 25
About these zones
Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.
Singapore Time is also known as SGT. To call Singapore, dial +65.
Singapore Time is approximately 9,150 miles north of Atlantic Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| AST-ATLANTIC | SGT | Day |
|---|---|---|
| 12:00 am | 11:00 am | Same day |
| 1:00 am | 12:00 pm | Same day |
| 2:00 am | 1:00 pm | Same day |
| 3:00 am | 2:00 pm | Same day |
| 4:00 am | 3:00 pm | Same day |
| 5:00 am | 4:00 pm | Same day |
| 6:00 am | 5:00 pm | Same day |
| 7:00 am | 6:00 pm | Same day |
| 8:00 am | 7:00 pm | Same day |
| 9:00 am | 8:00 pm | Same day |
| 10:00 am | 9:00 pm | Same day |
| 11:00 am | 10:00 pm | Same day |
| 12:00 pm | 11:00 pm | Same day |
| 1:00 pm | 12:00 am | +1 day |
| 2:00 pm | 1:00 am | +1 day |
| 3:00 pm | 2:00 am | +1 day |
| 4:00 pm | 3:00 am | +1 day |
| 5:00 pm | 4:00 am | +1 day |
| 6:00 pm | 5:00 am | +1 day |
| 7:00 pm | 6:00 am | +1 day |
| 8:00 pm | 7:00 am | +1 day |
| 9:00 pm | 8:00 am | +1 day |
| 10:00 pm | 9:00 am | +1 day |
| 11:00 pm | 10:00 am | +1 day |
Daylight saving time
Atlantic Time observes daylight saving time; Singapore Time does not. The offset between the two zones changes when Atlantic Time transitions: on Sunday, November 1, 2026, clocks fall back from ADT to AST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:31 AM
- Sunset
- 8:56 PM
- Day length
- 15h 25m
- Sunrise
- 6:58 AM
- Sunset
- 7:10 PM
- Day length
- 12h 12m
Daylight overlap: 2h 39m — 5:31 AM–8:10 AM in Atlantic Time (4:31 PM–7:10 PM in Singapore Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Atlantic Time
Cities in Singapore Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Atlantic Time
- YHZ
Airports in Singapore Time
- SIN
Related conversions
Common conversions
- What is 9:00 am AST-ATLANTIC in SGT?
- 9:00 am AST-ATLANTIC is 8:00 pm SGT.
- What is 12:00 pm AST-ATLANTIC in SGT?
- 12:00 pm AST-ATLANTIC is 11:00 pm SGT.
- What is 12:30 pm AST-ATLANTIC in SGT?
- 12:30 pm AST-ATLANTIC is 11:30 pm SGT.
- What is 2:00 pm AST-ATLANTIC in SGT?
- 2:00 pm AST-ATLANTIC is 1:00 am SGT, the next day.
- What is 5:00 pm AST-ATLANTIC in SGT?
- 5:00 pm AST-ATLANTIC is 4:00 am SGT, the next day.
- What is 11:30 pm AST-ATLANTIC in SGT?
- 11:30 pm AST-ATLANTIC is 10:30 am SGT, the next day.