Lisbon to Groton, CT: time difference
Groton, CT is 5 h behind Lisbon. 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.
Lisbon 21:38 9:38 PM Groton, CT 16:38 4:38 PM You –:–
21:38 9:38 PM
Western European Summer Time · UTC+1
☀️ 07:51 · 🌙 18:53
16:38 4:38 PM
Eastern Daylight Time · UTC-4
☀️ 07:06 · 🌙 18:01
·
−5 h
Groton, CT is 5 h behind Lisbon.
When you, Lisbon and Groton, CT are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇵🇹 Lisbon
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
🇺🇸 Groton, CT
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 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
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇹 Lisbon | 🇺🇸 Groton, CT |
|---|---|---|
| Local time | 21:38 | 16:38 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Western European Summer Time | Eastern Daylight Time |
| UTC offset | UTC+1 | UTC-4 |
| Offset from Lisbon | — | −5 h |
| IANA zone | Europe/Lisbon | America/New York |
| Daylight saving | On summer time → UTC+0, Oct 25, 01:00 | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 07:51 | 07:06 |
| Sunset | 18:53 | 18:01 |
| Daylight | 11 h 2 min | 10 h 55 min |
| People on this clock | 545,923 | 40,115 |
Compare Lisbon with another city
More comparisons with Lisbon: the time zones next to it and the far side of the clock.
Big time differences
Lisbon and Groton, CT: common questions
What is the time difference between Lisbon and Groton, CT?
Groton is 5 hours behind: it uses UTC−4, while Lisbon is on UTC+1.
What time is it in Groton, CT, at the start of the working day in Lisbon?
The working day in Lisbon starts at 9:00 AM; in Groton it is 4:00 AM at that moment.
What time is it in Groton, CT, at the end of the working day in Lisbon?
The working day in Lisbon ends at 6:00 PM; in Groton it is 1:00 PM at that moment.
When do working hours in Lisbon and in Groton, CT, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 2:00 PM to 6:00 PM in Lisbon, which is 9:00 AM to 1:00 PM in Groton.
Until what time in Lisbon is it still yesterday in Groton, CT?
Before 5:00 AM in Lisbon, the date in Groton has not changed yet. From 7:00 PM in Groton, it is already the next day in Lisbon.
Is the time difference between Lisbon and Groton, CT, the same all year?
No. Both places use summer time, but they switch on different dates, so for a while the gap changes. From October 25, 2026, Groton will be 4 hours behind Lisbon.
