Offset
The time difference between Iran Standard Time and Cuba Standard Time is 7.5 hours.
Iran Standard Time (IRST) is ahead of Cuba Standard Time (CDT).
IRST: UTC+3:30
CDT: UTC-4
Cuba Standard Time is currently observing daylight saving time; Iran Standard Time is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Iran Standard Time and Cuba Standard Time don't overlap on the same weekday. Cuba Standard Time is 7 hours behind Iran Standard Time.
With some flexibility, there’s a workable window outside standard hours:
- 3 PM–8 PM in Iran Standard Time (7 AM–12 PM in Cuba Standard Time) — suggest 5:00 PM Iran Standard Time (9:30 AM Cuba Standard 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.
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
About these zones
Iran Standard Time is also known as IRST. To call Iran, dial +98.
Cuba Standard Time is also known as CST, or CDT. To call Cuba, dial +53.
Cuba Standard Time is approximately 7,350 miles northwest of Iran Standard Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| IRST | CST-CUBA | Day |
|---|---|---|
| 12:00 am | 4:30 pm | -1 day |
| 1:00 am | 5:30 pm | -1 day |
| 2:00 am | 6:30 pm | -1 day |
| 3:00 am | 7:30 pm | -1 day |
| 4:00 am | 8:30 pm | -1 day |
| 5:00 am | 9:30 pm | -1 day |
| 6:00 am | 10:30 pm | -1 day |
| 7:00 am | 11:30 pm | -1 day |
| 8:00 am | 12:30 am | Same day |
| 9:00 am | 1:30 am | Same day |
| 10:00 am | 2:30 am | Same day |
| 11:00 am | 3:30 am | Same day |
| 12:00 pm | 4:30 am | Same day |
| 1:00 pm | 5:30 am | Same day |
| 2:00 pm | 6:30 am | Same day |
| 3:00 pm | 7:30 am | Same day |
| 4:00 pm | 8:30 am | Same day |
| 5:00 pm | 9:30 am | Same day |
| 6:00 pm | 10:30 am | Same day |
| 7:00 pm | 11:30 am | Same day |
| 8:00 pm | 12:30 pm | Same day |
| 9:00 pm | 1:30 pm | Same day |
| 10:00 pm | 2:30 pm | Same day |
| 11:00 pm | 3:30 pm | Same day |
Daylight saving time
Cuba Standard Time observes daylight saving time; Iran Standard Time does not. The offset between the two zones changes when Cuba Standard Time transitions: on Sunday, November 1, 2026, clocks fall back from CDT to CST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:50 AM
- Sunset
- 7:18 PM
- Day length
- 14h 28m
- Sunrise
- 6:44 AM
- Sunset
- 8:14 PM
- Day length
- 13h 30m
Daylight overlap: 5h 4m — 2:14 PM–7:18 PM in Iran Standard Time (6:44 AM–11:48 AM in Cuba Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Cuba Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Airports in Cuba Standard Time
- HAV
Related conversions
Common conversions
- What is 9:00 am IRST in CST-CUBA?
- 9:00 am IRST is 1:30 am CST-CUBA.
- What is 12:00 pm IRST in CST-CUBA?
- 12:00 pm IRST is 4:30 am CST-CUBA.
- What is 12:30 pm IRST in CST-CUBA?
- 12:30 pm IRST is 5:00 am CST-CUBA.
- What is 2:00 pm IRST in CST-CUBA?
- 2:00 pm IRST is 6:30 am CST-CUBA.
- What is 5:00 pm IRST in CST-CUBA?
- 5:00 pm IRST is 9:30 am CST-CUBA.
- What is 11:30 pm IRST in CST-CUBA?
- 11:30 pm IRST is 4:00 pm CST-CUBA.