Denver is 1 hour behind Calgary in winter and on the same time in summer. Updated for the 2026 time zone changes and current daylight saving rules.
| Starting | Denver is | Calgary / Denver |
|---|---|---|
| Nov 1, 2026 | 1 hour behind | UTC−6 / UTC−7 |
| Mar 14, 2027 Denver springs forward | same time | UTC−6 / UTC−6 |
| Nov 7, 2027 Denver falls back | 1 hour behind | UTC−6 / UTC−7 |
Alberta Time. UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026.
Mountain Time. UTC−7 in winter and UTC−6 from the second Sunday in March to the first Sunday in November.
Winter: A 9-to-5 workday overlaps for 7 hours: 10:00 AM to 5:00 PM in Calgary, which is 9:00 AM to 4:00 PM in Denver.
Summer: A 9-to-5 workday overlaps for the full 8 hours: 9:00 AM to 5:00 PM in Calgary, which is 9:00 AM to 5:00 PM in Denver.
Denver is 1 hour behind Calgary in winter and on the same time in summer.
Calgary uses Alberta Time: UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026. Denver uses Mountain Time: UTC−7 in winter and UTC−6 from the second Sunday in March to the first Sunday in November.
In winter: A 9-to-5 workday overlaps for 7 hours: 10:00 AM to 5:00 PM in Calgary, which is 9:00 AM to 4:00 PM in Denver. In summer: A 9-to-5 workday overlaps for the full 8 hours: 9:00 AM to 5:00 PM in Calgary, which is 9:00 AM to 5:00 PM in Denver.