Istanbul to Viana do Castelo: time difference
Viana do Castelo is 2 h behind Istanbul. Live clocks for both, the working hours they share, and how each one sits against your own time.
🇵🇹 Viana do Castelo, Portugal
03
- Western European Summer Time
- UTC+1
- Night
☀️ 07:50 · 🌙 18:53 · 11 h 3 min
−2 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Istanbul 00:10 12:10 AM Viana do Castelo 22:10 10:10 PM You –:–
00:10 12:10 AM
GMT+03:00 · UTC+3
☀️ 07:18 · 🌙 18:22
22:10 10:10 PM
Western European Summer Time · UTC+1
☀️ 07:50 · 🌙 18:53
·
−2 h
Viana do Castelo is 2 h behind Istanbul.
When you, Istanbul and Viana do Castelo are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇹🇷 Istanbul
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇵🇹 Viana do Castelo
22 10 PM 23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇹🇷 Istanbul | 🇵🇹 Viana do Castelo |
|---|---|---|
| Local time | 00:10 | 22:10 |
| Local date | Sunday, October 18, 2026 | Saturday, October 17, 2026 |
| Time zone | GMT+03:00 | Western European Summer Time |
| UTC offset | UTC+3 | UTC+1 |
| Offset from Istanbul | — | −2 h |
| IANA zone | Europe/Istanbul | Europe/Lisbon |
| Daylight saving | Not observed | On summer time → UTC+0, Oct 25, 01:00 |
| Sunrise | 07:18 | 07:50 |
| Sunset | 18:22 | 18:53 |
| Daylight | 11 h 5 min | 11 h 3 min |
| People on this clock | 15,701,602 | 85,784 |
Compare Istanbul with another city
More comparisons with Istanbul: the time zones next to it and the far side of the clock.
Big time differences
Istanbul and Viana do Castelo: common questions
How many hours behind Istanbul is Viana do Castelo?
The clocks in Viana do Castelo are 2 hours behind those in Istanbul (UTC+1 and UTC+3).
If it is 9:00 AM in Istanbul, what time is it in Viana do Castelo?
At 9:00 AM in Istanbul, clocks in Viana do Castelo show 7:00 AM.
If it is 6:00 PM in Istanbul, what time is it in Viana do Castelo?
At 6:00 PM in Istanbul, clocks in Viana do Castelo show 4:00 PM.
Is there a time when both Istanbul and Viana do Castelo are at work?
Yes: from 11:00 AM to 6:00 PM in Istanbul (9:00 AM to 4:00 PM in Viana do Castelo), the working days (9:00 AM–6:00 PM) overlap.
When is it still the previous day in Viana do Castelo?
Until 2:00 AM in Istanbul it is still the previous day in Viana do Castelo. The other way round, from 10:00 PM in Viana do Castelo it is already the next day in Istanbul.
Does the time gap between Istanbul and Viana do Castelo change during the year?
Yes – daylight saving time is used in Viana do Castelo but not in Istanbul. From October 25, 2026, Viana do Castelo will be 3 hours behind Istanbul.
