Offset
The time difference between Cuba Standard Time and Atlantic Time is 1 hour.
Cuba Standard Time (CDT) is behind Atlantic Time (ADT).
CDT: UTC-4
ADT: UTC-3
Both zones are currently observing daylight saving time.
When to schedule
Business-hours overlap: 9 AM–4 PM in Cuba Standard Time (10 AM–5 PM in Atlantic Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 12:00 PM Cuba Standard Time (1:00 PM Atlantic Time).
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.
Cuba
- Triumph of the RevolutionThu, Jan 1
- Victory of Fidel CastroFri, Jan 2
- Good FridayFri, Apr 3
- Labour DayFri, May 1
- Day before the Commemoration of the Assault of the Moncada garrisonSat, Jul 25
- Commemoration of the Assault of the Moncada garrisonSun, Jul 26
- Day after the Commemoration of the Assault of the Moncada garrisonMon, Jul 27
- Independence DaySat, Oct 10
- Christmas DayFri, Dec 25
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
About these zones
Cuba Standard Time is also known as CST, or CDT. To call Cuba, dial +53.
Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.
Atlantic Time is approximately 1,850 miles northeast of Cuba Standard Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| CST-CUBA | AST-ATLANTIC | Day |
|---|---|---|
| 12:00 am | 1:00 am | Same day |
| 1:00 am | 2:00 am | Same day |
| 2:00 am | 3:00 am | Same day |
| 3:00 am | 4:00 am | Same day |
| 4:00 am | 5:00 am | Same day |
| 5:00 am | 6:00 am | Same day |
| 6:00 am | 7:00 am | Same day |
| 7:00 am | 8:00 am | Same day |
| 8:00 am | 9:00 am | Same day |
| 9:00 am | 10:00 am | Same day |
| 10:00 am | 11:00 am | Same day |
| 11:00 am | 12:00 pm | Same day |
| 12:00 pm | 1:00 pm | Same day |
| 1:00 pm | 2:00 pm | Same day |
| 2:00 pm | 3:00 pm | Same day |
| 3:00 pm | 4:00 pm | Same day |
| 4:00 pm | 5:00 pm | Same day |
| 5:00 pm | 6:00 pm | Same day |
| 6:00 pm | 7:00 pm | Same day |
| 7:00 pm | 8:00 pm | Same day |
| 8:00 pm | 9:00 pm | Same day |
| 9:00 pm | 10:00 pm | Same day |
| 10:00 pm | 11:00 pm | Same day |
| 11:00 pm | 12:00 am | +1 day |
Daylight saving time
Both Cuba Standard Time and Atlantic Time observe daylight saving time and transition on the same date.
Next transition: Sunday, November 1, 2026 (fall back).
Because they transition simultaneously, the offset between these zones remains constant year-round.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 6:44 AM
- Sunset
- 8:14 PM
- Day length
- 13h 30m
- Sunrise
- 5:31 AM
- Sunset
- 8:56 PM
- Day length
- 15h 25m
Daylight overlap: 13h 12m — 6:44 AM–7:56 PM in Cuba Standard Time (7:44 AM–8:56 PM in Atlantic Time). Both locations are in daylight during this window.
Cities in these zones
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Cuba Standard Time
- HAV
Airports in Atlantic Time
- YHZ
Related conversions
Common conversions
- What is 9:00 am CST-CUBA in AST-ATLANTIC?
- 9:00 am CST-CUBA is 10:00 am AST-ATLANTIC.
- What is 12:00 pm CST-CUBA in AST-ATLANTIC?
- 12:00 pm CST-CUBA is 1:00 pm AST-ATLANTIC.
- What is 12:30 pm CST-CUBA in AST-ATLANTIC?
- 12:30 pm CST-CUBA is 1:30 pm AST-ATLANTIC.
- What is 2:00 pm CST-CUBA in AST-ATLANTIC?
- 2:00 pm CST-CUBA is 3:00 pm AST-ATLANTIC.
- What is 5:00 pm CST-CUBA in AST-ATLANTIC?
- 5:00 pm CST-CUBA is 6:00 pm AST-ATLANTIC.
- What is 11:30 pm CST-CUBA in AST-ATLANTIC?
- 11:30 pm CST-CUBA is 12:30 am AST-ATLANTIC, the next day.