Teresina to Reykjavik: time difference
Reykjavik is 3 h ahead of Teresina. 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.
Teresina 09:23 9:23 AM Reykjavik 12:23 12:23 PM You –:–
09:23 9:23 AM
Brasilia Standard Time · UTC-3
☀️ 05:33 · 🌙 17:45
12:23 12:23 PM
Greenwich Mean Time · UTC+0
☀️ 08:03 · 🌙 18:28
·
+3 h
Reykjavik is 3 h ahead of Teresina.
When you, Teresina and Reykjavik are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇧🇷 Teresina
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
🇮🇸 Reykjavik
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 0 12 AM 1 1 AM 2 2 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇧🇷 Teresina | 🇮🇸 Reykjavik |
|---|---|---|
| Local time | 09:23 | 12:23 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Brasilia Standard Time | Greenwich Mean Time |
| UTC offset | UTC-3 | UTC+0 |
| Offset from Teresina | — | +3 h |
| IANA zone | America/Fortaleza | Atlantic/Reykjavik |
| Daylight saving | Not observed | Not observed |
| Sunrise | 05:33 | 08:03 |
| Sunset | 17:45 | 18:28 |
| Daylight | 12 h 11 min | 10 h 25 min |
| People on this clock | 866,300 | 136,894 |
Compare Teresina with another city
More comparisons with Teresina: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Teresina and Reykjavik: common questions
How far ahead of Teresina is Reykjavik?
Reykjavik is 3 hours ahead of Teresina: UTC+0 against UTC−3.
If it is 9:00 AM in Teresina, what time is it in Reykjavik?
At 9:00 AM in Teresina, clocks in Reykjavik show 12:00 PM.
If it is 6:00 PM in Teresina, what time is it in Reykjavik?
At 6:00 PM in Teresina, clocks in Reykjavik show 9:00 PM.
Is there a time when both Teresina and Reykjavik are at work?
Yes: from 9:00 AM to 3:00 PM in Teresina (12:00 PM to 6:00 PM in Reykjavik), the working days (9:00 AM–6:00 PM) overlap.
When is it already the next day in Reykjavik?
From 9:00 PM in Teresina it is already the next day in Reykjavik. The other way round, until 3:00 AM in Reykjavik it is still the previous day in Teresina.
Is the time difference between Teresina and Reykjavik the same all year?
Yes. Neither Teresina nor Reykjavik switches to summer time, so the gap is always 3 hours.
