Calgary is typically 7 hours behind London. When it's 5:00 PM in London, it's 10:00 AM in Calgary. Both cities observe daylight saving time, but they switch on slightly different schedules.
During most of the year, the difference is 7 hours. During the brief periods when North American and UK DST schedules don't align, the difference can be 6 or 8 hours.
Optimal meeting window: 8:00 AM - 10:00 AM Calgary time (3:00 PM - 5:00 PM London). Morning Calgary catches afternoon London before end of business.
Calgary is Canada's energy capital, with many oil and gas companies connected to the UK energy sector. British Petroleum and Shell have significant operations in Alberta's oil sands.