Groton, CT to Lisbon: time difference
Lisbon is 5 h ahead of Groton, CT. Live clocks for both, the working hours they share, and how each one sits against your own time.
+5 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Groton, CT 15:51 3:51 PM Lisbon 20:51 8:51 PM You –:–
15:51 3:51 PM
Eastern Daylight Time · UTC-4
☀️ 07:06 · 🌙 18:01
20:51 8:51 PM
Western European Summer Time · UTC+1
☀️ 07:51 · 🌙 18:53
·
+5 h
Lisbon is 5 h ahead of Groton, CT.
When you, Groton, CT and Lisbon are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Groton, CT
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
🇵🇹 Lisbon
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 3 3 AM 4 4 AM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Groton, CT | 🇵🇹 Lisbon |
|---|---|---|
| Local time | 15:51 | 20:51 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Eastern Daylight Time | Western European Summer Time |
| UTC offset | UTC-4 | UTC+1 |
| Offset from Groton, CT | — | +5 h |
| IANA zone | America/New York | Europe/Lisbon |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | On summer time → UTC+0, Oct 25, 01:00 |
| Sunrise | 07:06 | 07:51 |
| Sunset | 18:01 | 18:53 |
| Daylight | 10 h 55 min | 11 h 2 min |
| People on this clock | 40,115 | 545,923 |
Compare Groton, CT with another city
More comparisons with Groton, CT: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Groton, CT and Lisbon: common questions
How far ahead of Groton, CT, is Lisbon?
Lisbon is 5 hours ahead of Groton: UTC+1 against UTC−4.
If it is 9:00 AM in Groton, CT, what time is it in Lisbon?
At 9:00 AM in Groton, clocks in Lisbon show 2:00 PM.
What time is it in Lisbon at the end of the working day in Groton, CT?
The working day in Groton ends at 6:00 PM; in Lisbon it is 11:00 PM at that moment.
Is there a time when both Groton, CT, and Lisbon are at work?
Yes: from 9:00 AM to 1:00 PM in Groton (2:00 PM to 6:00 PM in Lisbon), the working days (9:00 AM–6:00 PM) overlap.
From what time in Groton, CT, is it tomorrow in Lisbon?
Once it is 7:00 PM in Groton, the date in Lisbon has already changed. Until 5:00 AM in Lisbon, it is still the previous day in Groton.
Does the time gap between Groton, CT, and Lisbon change during the year?
Yes, because the clocks in Groton and in Lisbon change on different dates. Next change: from October 25, 2026, Lisbon will be 4 hours ahead of Groton.
