Time difference between London and Calgary
Good time for both on a weekday: 16:00–17:00 in London = 9:00–10:00 in Calgary.
- Everyone at work
- Work hours
- Awake
- Night
- Weekend
Tap any column to see that moment in every city.
Different hours for each city
- 7 hoursCalgary behind London
- UTC / UTC+1London, January / July
- UTC−7 / UTC−6Calgary, January / July
- 1 hourshared 9-to-5 time
How the gap moves through the year
Calgary is 7 hours behind London for about 9 months of the year.
Calgary is 6 hours behind London for about 3 months of the year.
From the last Sunday in March (when London moves forward), Calgary is 7 hours behind London.
From the last Sunday in October (when London falls back), Calgary is 6 hours behind London.
London moves its clocks forward one hour on the last Sunday in March at 1:00 am local time and back on the last Sunday in October at 2:00 am, switching between Greenwich Mean Time (UTC) and British Summer Time (UTC+1).
Calgary changes its clocks on dates that do not follow a fixed weekday rule (Mountain Standard Time / Mountain Daylight Time); check the date before you book.
Next clock change for this pair, as of when this page was built (2026-10-20): London falls back on Sun 25 October 2026.
Everything on this page also holds if you swap London for Birmingham, Dublin, Glasgow, Manchester or Lisbon, or Calgary for Edmonton — those cities follow exactly the same clock all year.
Working hours that overlap
In January, a 9-to-5 day in both cities shares 1 hour: 4:00 pm–5:00 pm in London, which is 9:00 am–10:00 am in Calgary.
July gives exactly the same window.
Across the week
At 9:00 on a Monday morning in London, it is 2:00 am on Monday in Calgary.
Daylight, distance and night calls
London and Calgary are about 7,040 km (4,370 miles) apart and 114° of longitude apart, which by the sun alone would be 7 hours 30 minutes.
London's winter clock sits within 2 minutes of the sun, and Calgary's runs 36 minutes ahead of the sun.
In mid-January the sun is up in London from about 7:59 am to 4:19 pm, and the sun is up in Calgary from about 8:33 am to 4:57 pm; both cities are in daylight at the same time for about 45 minutes.
In mid-July the sun is up in London from about 5:00 am to 9:12 pm, and the sun is up in Calgary from about 5:38 am to 9:46 pm; both cities are in daylight at the same time for about 8 hours 30 minutes.
In January, 4 hours of a London office day fall in Calgary's night (10 pm to 6 am), and 2 hours of a Calgary office day fall in London's night.
In July, 4 hours of a London office day fall in Calgary's night (10 pm to 6 am), and 2 hours of a Calgary office day fall in London's night.
Hour-by-hour table and common mistakes — 2 more sections
| London | Calgary, January | Calgary, July |
|---|---|---|
| 12:00 am | 5:00 pm (−1 day) | 5:00 pm (−1 day) |
| 1:00 am | 6:00 pm (−1 day) | 6:00 pm (−1 day) |
| 2:00 am | 7:00 pm (−1 day) | 7:00 pm (−1 day) |
| 3:00 am | 8:00 pm (−1 day) | 8:00 pm (−1 day) |
| 4:00 am | 9:00 pm (−1 day) | 9:00 pm (−1 day) |
| 5:00 am | 10:00 pm (−1 day) | 10:00 pm (−1 day) |
| 6:00 am | 11:00 pm (−1 day) | 11:00 pm (−1 day) |
| 7:00 am | 12:00 am | 12:00 am |
| 8:00 am | 1:00 am | 1:00 am |
| 9:00 am | 2:00 am | 2:00 am |
| 10:00 am | 3:00 am | 3:00 am |
| 11:00 am | 4:00 am | 4:00 am |
| 12:00 pm | 5:00 am | 5:00 am |
| 1:00 pm | 6:00 am | 6:00 am |
| 2:00 pm | 7:00 am | 7:00 am |
| 3:00 pm | 8:00 am | 8:00 am |
| 4:00 pm | 9:00 am | 9:00 am |
| 5:00 pm | 10:00 am | 10:00 am |
| 6:00 pm | 11:00 am | 11:00 am |
| 7:00 pm | 12:00 pm | 12:00 pm |
| 8:00 pm | 1:00 pm | 1:00 pm |
| 9:00 pm | 2:00 pm | 2:00 pm |
| 10:00 pm | 3:00 pm | 3:00 pm |
| 11:00 pm | 4:00 pm | 4:00 pm |
Common mistakes with London and Calgary
- Assuming the gap is fixed. Both cities change their clocks, but not on the same weekend, so a recurring meeting can land an hour off for a few weeks.
- Writing “GMT” all year for London. In summer the zone is British Summer Time; calendar apps handle it, but a typed time in an email can be read the wrong way.
Questions
- Is Calgary ahead of London?
- Calgary is 7 hours behind London for most of the year.
- What is a good time for a meeting between London and Calgary?
- With 9-to-5 days in both cities, 4:00 pm–5:00 pm London time is inside working hours in both, which gives 1 hour. The window can shift by an hour in the weeks when only one city has changed its clocks.
- Does the time difference between London and Calgary change?
- Yes. Calgary is 7 hours behind London for about 9 months of the year. Calgary is 6 hours behind London for about 3 months of the year.
Related time differences
- New York and LondonLondon ahead by 5 hours · 3 hours of shared office time
- London and Los AngelesLos Angeles behind by 8 hours · no shared office hours
- London and SydneySydney ahead by 9–11 hours · no shared office hours
- London and DubaiDubai ahead by 3–4 hours · 5 hours of shared office time
- London and BrisbaneBrisbane ahead by 9–10 hours · no shared office hours
- London and SingaporeSingapore ahead by 7–8 hours · 1 hour of shared office time
- London and VancouverVancouver behind by 8 hours · no shared office hours
- London and ChicagoChicago behind by 6 hours · 2 hours of shared office time
- London and AmsterdamAmsterdam ahead by 1 hour · 7 hours of shared office time
- London and TokyoTokyo ahead by 8–9 hours · no shared office hours
London time zone · Calgary time zone · Plan with more cities
City names, coordinates and time zone assignments: GeoNames, licensed under CC BY 4.0 (selection and renaming of some cities by this site). Clock times are computed in your browser from the IANA time zone database. Sources and limits.