London is 6 hours ahead of Calgary in winter and 7 hours ahead in summer. Updated for the 2026 time zone changes and current daylight saving rules.
| Starting | London is | Calgary / London |
|---|---|---|
| Nov 1, 2026 | 6 hours ahead | UTC−6 / UTC+0 |
| Mar 28, 2027 London springs forward | 7 hours ahead | UTC−6 / UTC+1 |
| Oct 31, 2027 London falls back | 6 hours ahead | UTC−6 / UTC+0 |
Alberta Time. UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026.
UK time. GMT (UTC+0) in winter and BST (UTC+1) from the last Sunday in March to the last Sunday in October.
Winter: A 9-to-5 workday overlaps for 2 hours: 9:00 AM to 11:00 AM in Calgary, which is 3:00 PM to 5:00 PM in London.
Summer: A 9-to-5 workday overlaps for 1 hour: 9:00 AM to 10:00 AM in Calgary, which is 4:00 PM to 5:00 PM in London.
London is 6 hours ahead of Calgary in winter and 7 hours ahead in summer.
Calgary uses Alberta Time: UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026. London uses UK time: GMT (UTC+0) in winter and BST (UTC+1) from the last Sunday in March to the last Sunday in October.
In winter: A 9-to-5 workday overlaps for 2 hours: 9:00 AM to 11:00 AM in Calgary, which is 3:00 PM to 5:00 PM in London. In summer: A 9-to-5 workday overlaps for 1 hour: 9:00 AM to 10:00 AM in Calgary, which is 4:00 PM to 5:00 PM in London.