Groton, CT to Calgary: time difference
Calgary is 2 h behind Groton, CT. 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.
Groton, CT 17:57 5:57 PM Calgary 15:57 3:57 PM You –:–
17:57 5:57 PM
Eastern Daylight Time · UTC-4
☀️ 07:06 · 🌙 18:01
15:57 3:57 PM
Mountain Daylight Time · UTC-6
☀️ 08:09 · 🌙 18:35
·
−2 h
Calgary is 2 h behind Groton, CT.
When you, Groton, CT and Calgary 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
🇨🇦 Calgary
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
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Time zones side by side
| Detail | 🇺🇸 Groton, CT | 🇨🇦 Calgary |
|---|---|---|
| Local time | 17:57 | 15:57 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Eastern Daylight Time | Mountain Daylight Time |
| UTC offset | UTC-4 | UTC-6 |
| Offset from Groton, CT | — | −2 h |
| IANA zone | America/New York | America/Edmonton |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 07:06 | 08:09 |
| Sunset | 18:01 | 18:35 |
| Daylight | 10 h 55 min | 10 h 26 min |
| People on this clock | 40,115 | 1,267,344 |
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 Calgary: common questions
What is the time difference between Groton, CT, and Calgary?
Calgary is 2 hours behind: it uses UTC−6, while Groton is on UTC−4.
What time is it in Calgary when it is 9:00 AM in Groton, CT?
When it is 9:00 AM in Groton, it is 7:00 AM in Calgary.
What time is it in Calgary when it is 6:00 PM in Groton, CT?
When it is 6:00 PM in Groton, it is 4:00 PM in Calgary.
When is a good time to call Calgary from Groton, CT?
Between 11:00 AM and 6:00 PM in Groton – that is 9:00 AM to 4:00 PM in Calgary – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in Calgary compared with Groton, CT?
The new day starts in Calgary later: until 2:00 AM in Groton, it is still the previous day there. From 10:00 PM in Calgary, Groton is already on the next day.
Does the time difference between Groton, CT, and Calgary change?
Yes. The clocks change only in Groton. From November 1, 2026, Calgary will be 1 hour behind Groton.
