Reykjavik to Teresina: time difference
Teresina is 3 h behind Reykjavik. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Reykjavik 07:43 7:43 AM Teresina 04:43 4:43 AM You –:–
07:43 7:43 AM
Greenwich Mean Time · UTC+0
☀️ 08:03 · 🌙 18:28
04:43 4:43 AM
Brasilia Standard Time · UTC-3
☀️ 05:33 · 🌙 17:45
·
−3 h
Teresina is 3 h behind Reykjavik.
When you, Reykjavik and Teresina are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇮🇸 Reykjavik
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
🇧🇷 Teresina
21 9 PM 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
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇮🇸 Reykjavik | 🇧🇷 Teresina |
|---|---|---|
| Local time | 07:43 | 04:43 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Greenwich Mean Time | Brasilia Standard Time |
| UTC offset | UTC+0 | UTC-3 |
| Offset from Reykjavik | — | −3 h |
| IANA zone | Atlantic/Reykjavik | America/Fortaleza |
| Daylight saving | Not observed | Not observed |
| Sunrise | 08:03 | 05:33 |
| Sunset | 18:28 | 17:45 |
| Daylight | 10 h 25 min | 12 h 11 min |
| People on this clock | 136,894 | 866,300 |
Compare Reykjavik with another city
More comparisons with Reykjavik: the time zones next to it and the far side of the clock.
Big time differences
Reykjavik and Teresina: common questions
How many hours behind Reykjavik is Teresina?
The clocks in Teresina are 3 hours behind those in Reykjavik (UTC−3 and UTC+0).
What time is it in Teresina at the start of the working day in Reykjavik?
The working day in Reykjavik starts at 9:00 AM; in Teresina it is 6:00 AM at that moment.
If it is 6:00 PM in Reykjavik, what time is it in Teresina?
At 6:00 PM in Reykjavik, clocks in Teresina show 3:00 PM.
When is a good time to call Teresina from Reykjavik?
Between 12:00 PM and 6:00 PM in Reykjavik – that is 9:00 AM to 3:00 PM in Teresina – both places are within working hours (9:00 AM–6:00 PM).
When is it still the previous day in Teresina?
Until 3:00 AM in Reykjavik it is still the previous day in Teresina. The other way round, from 9:00 PM in Teresina it is already the next day in Reykjavik.
Does the time gap between Reykjavik and Teresina change during the year?
No, the clocks change neither in Reykjavik nor in Teresina, so the gap is 3 hours all year round.
