Offset
The time difference between Istanbul and Hanoi is 4 hours.
Istanbul (TRT) is behind Hanoi (ICT).
TRT: UTC+3
ICT: UTC+7
Neither Istanbul nor Hanoi is currently observing daylight saving time.
When to schedule
Business-hours overlap: 9 AM–1 PM in Istanbul (1 PM–5 PM in Hanoi).
Both teams are in working hours during this window on weekdays.
Suggested time: 11:00 AM Istanbul (3:00 PM Hanoi).
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.
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
Vietnam
- New Year's DayThu, Jan 1
- Reunification DayThu, Apr 30
- Labour DayFri, May 1
- National DayWed, Sep 2
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Istanbul | Hanoi | Day |
|---|---|---|
| 12:00 am | 4:00 am | Same day |
| 1:00 am | 5:00 am | Same day |
| 2:00 am | 6:00 am | Same day |
| 3:00 am | 7:00 am | Same day |
| 4:00 am | 8:00 am | Same day |
| 5:00 am | 9:00 am | Same day |
| 6:00 am | 10:00 am | Same day |
| 7:00 am | 11:00 am | Same day |
| 8:00 am | 12:00 pm | Same day |
| 9:00 am | 1:00 pm | Same day |
| 10:00 am | 2:00 pm | Same day |
| 11:00 am | 3:00 pm | Same day |
| 12:00 pm | 4:00 pm | Same day |
| 1:00 pm | 5:00 pm | Same day |
| 2:00 pm | 6:00 pm | Same day |
| 3:00 pm | 7:00 pm | Same day |
| 4:00 pm | 8:00 pm | Same day |
| 5:00 pm | 9:00 pm | Same day |
| 6:00 pm | 10:00 pm | Same day |
| 7:00 pm | 11:00 pm | Same day |
| 8:00 pm | 12:00 am | +1 day |
| 9:00 pm | 1:00 am | +1 day |
| 10:00 pm | 2:00 am | +1 day |
| 11:00 pm | 3:00 am | +1 day |
Daylight saving time
Neither Istanbul nor Hanoi 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
- 5:33 AM
- Sunset
- 8:36 PM
- Day length
- 15h 4m
- Sunrise
- 5:15 AM
- Sunset
- 6:38 PM
- Day length
- 13h 23m
Daylight overlap: 9h 6m — 5:33 AM–2:38 PM in Istanbul (9:33 AM–6:38 PM in Hanoi). Both locations are in daylight during this window.
Cities in these zones
Other cities in Turkey Time
Other cities in Indochina Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Turkey Time
- IST
- SAW
- ESB
- YEI
- ADB
- GZT
- DIY
- ADA
- COV
- ASR
Airports in Indochina Time
- HAN
- BKK
- DMK
- HPH
Related conversions
Common conversions
- What is 9:00 am Istanbul in Hanoi?
- 9:00 am Istanbul is 1:00 pm Hanoi.
- What is 12:00 pm Istanbul in Hanoi?
- 12:00 pm Istanbul is 4:00 pm Hanoi.
- What is 12:30 pm Istanbul in Hanoi?
- 12:30 pm Istanbul is 4:30 pm Hanoi.
- What is 2:00 pm Istanbul in Hanoi?
- 2:00 pm Istanbul is 6:00 pm Hanoi.
- What is 5:00 pm Istanbul in Hanoi?
- 5:00 pm Istanbul is 9:00 pm Hanoi.
- What is 11:30 pm Istanbul in Hanoi?
- 11:30 pm Istanbul is 3:30 am Hanoi, the next day.