Istanbul to Oeiras: time difference
Oeiras is 2 h behind Istanbul. Live clocks for both, the working hours they share, and how each one sits against your own time.
−2 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Istanbul 07:09 7:09 AM Oeiras 05:09 5:09 AM You –:–
07:09 7:09 AM
GMT+03:00 · UTC+3
☀️ 07:20 · 🌙 18:19
05:09 5:09 AM
Western European Summer Time · UTC+1
☀️ 07:51 · 🌙 18:55
·
−2 h
Oeiras is 2 h behind Istanbul.
When you, Istanbul and Oeiras 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
🇵🇹 Oeiras
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 | 🇵🇹 Oeiras |
|---|---|---|
| Local time | 07:09 | 05:09 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 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 | 07:20 | 07:51 |
| Sunset | 18:19 | 18:55 |
| Daylight | 10 h 59 min | 11 h 4 min |
| People on this clock | 15,701,602 | 171,767 |
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 Oeiras: common questions
How many hours behind Istanbul is Oeiras?
The clocks in Oeiras are 2 hours behind those in Istanbul (UTC+1 and UTC+3).
What time is it in Oeiras at the start of the working day in Istanbul?
The working day in Istanbul starts at 9:00 AM; in Oeiras it is 7:00 AM at that moment.
What time is it in Oeiras at the end of the working day in Istanbul?
The working day in Istanbul ends at 6:00 PM; in Oeiras it is 4:00 PM at that moment.
When is a good time to call Oeiras from Istanbul?
Between 11:00 AM and 6:00 PM in Istanbul – that is 9:00 AM to 4:00 PM in Oeiras – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Oeiras compared with Istanbul?
The new day starts in Oeiras later: until 2:00 AM in Istanbul, it is still the previous day there. From 10:00 PM in Oeiras, Istanbul is already on the next day.
Is the time difference between Istanbul and Oeiras the same all year?
No. Only Oeiras switches to summer time, so the gap changes twice a year. From October 25, 2026, Oeiras will be 3 hours behind Istanbul.
