Offset
The time difference between Chattogram and Istanbul is 3 hours.
Chattogram (BST) is ahead of Istanbul (TRT).
BST: UTC+6
TRT: UTC+3
Neither Chattogram nor Istanbul is currently observing daylight saving time.
When to schedule
Business-hours overlap: 12 PM–5 PM in Chattogram (9 AM–2 PM in Istanbul).
Both teams are in working hours during this window on weekdays.
Suggested time: 2:00 PM Chattogram (11:00 AM Istanbul).
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.
Bangladesh
- International Mother Language DaySat, Feb 21
- Independence and National DayThu, Mar 26
- Bengali New YearTue, Apr 14
- Labour DayFri, May 1
- July Mass Uprising DayWed, Aug 5
- Victory DayWed, Dec 16
- Christmas DayFri, Dec 25
Turkey
- New Year's DayThu, Jan 1
- National Independence & Children's DayThu, Apr 23
- Labour DayFri, May 1
- Atatürk Commemoration & Youth DayTue, May 19
- Democracy and National Unity DayWed, Jul 15
- Victory DaySun, Aug 30
- Republic DayThu, Oct 29
About these zones
Chattogram uses Bangladesh Standard Time (BST). To call Bangladesh, dial +880.
Istanbul uses Turkey Time (TRT). To call Turkey, dial +90.
Istanbul is approximately 3,850 miles northwest of Chattogram.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Chattogram | Istanbul | Day |
|---|---|---|
| 12:00 am | 9:00 pm | -1 day |
| 1:00 am | 10:00 pm | -1 day |
| 2:00 am | 11:00 pm | -1 day |
| 3:00 am | 12:00 am | Same day |
| 4:00 am | 1:00 am | Same day |
| 5:00 am | 2:00 am | Same day |
| 6:00 am | 3:00 am | Same day |
| 7:00 am | 4:00 am | Same day |
| 8:00 am | 5:00 am | Same day |
| 9:00 am | 6:00 am | Same day |
| 10:00 am | 7:00 am | Same day |
| 11:00 am | 8:00 am | Same day |
| 12:00 pm | 9:00 am | Same day |
| 1:00 pm | 10:00 am | Same day |
| 2:00 pm | 11:00 am | Same day |
| 3:00 pm | 12:00 pm | Same day |
| 4:00 pm | 1:00 pm | Same day |
| 5:00 pm | 2:00 pm | Same day |
| 6:00 pm | 3:00 pm | Same day |
| 7:00 pm | 4:00 pm | Same day |
| 8:00 pm | 5:00 pm | Same day |
| 9:00 pm | 6:00 pm | Same day |
| 10:00 pm | 7:00 pm | Same day |
| 11:00 pm | 8:00 pm | Same day |
Daylight saving time
Neither Chattogram nor Istanbul observes daylight saving time. 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
- 5:20 AM
- Sunset
- 6:39 PM
- Day length
- 13h 19m
- Sunrise
- 5:49 AM
- Sunset
- 8:33 PM
- Day length
- 14h 44m
Daylight overlap: 9h 50m — 8:49 AM–6:39 PM in Chattogram (5:49 AM–3:39 PM in Istanbul). Both locations are in daylight during this window.
Cities in these zones
Other cities in Turkey Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Bangladesh Standard Time
- DAC
- CGP
- JSR
Airports in Turkey Time
- IST
- SAW
- ESB
- YEI
- ADB
- GZT
- DIY
- ADA
- COV
- ASR
Related conversions
Common conversions
- What is 9:00 am Chattogram in Istanbul?
- 9:00 am Chattogram is 6:00 am Istanbul.
- What is 12:00 pm Chattogram in Istanbul?
- 12:00 pm Chattogram is 9:00 am Istanbul.
- What is 12:30 pm Chattogram in Istanbul?
- 12:30 pm Chattogram is 9:30 am Istanbul.
- What is 2:00 pm Chattogram in Istanbul?
- 2:00 pm Chattogram is 11:00 am Istanbul.
- What is 5:00 pm Chattogram in Istanbul?
- 5:00 pm Chattogram is 2:00 pm Istanbul.
- What is 11:30 pm Chattogram in Istanbul?
- 11:30 pm Chattogram is 8:30 pm Istanbul.