Montreal is 1 hour ahead of Calgary in winter and 2 hours ahead in summer. Updated for the 2026 time zone changes and current daylight saving rules.
| Starting | Montreal is | Calgary / Montreal |
|---|---|---|
| Nov 1, 2026 | 1 hour ahead | UTC−6 / UTC−5 |
| Mar 14, 2027 Montreal springs forward | 2 hours ahead | UTC−6 / UTC−4 |
| Nov 7, 2027 Montreal falls back | 1 hour ahead | UTC−6 / UTC−5 |
Alberta Time. UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026.
Eastern Time. UTC−5 in winter and UTC−4 from the second Sunday in March to the first Sunday in November.
Winter: A 9-to-5 workday overlaps for 7 hours: 9:00 AM to 4:00 PM in Calgary, which is 10:00 AM to 5:00 PM in Montreal.
Summer: A 9-to-5 workday overlaps for 6 hours: 9:00 AM to 3:00 PM in Calgary, which is 11:00 AM to 5:00 PM in Montreal.
Montreal is 1 hour ahead of Calgary in winter and 2 hours ahead in summer.
Calgary uses Alberta Time: UTC−6 all year. Alberta stopped changing its clocks on Nov 1, 2026. Montreal uses Eastern Time: UTC−5 in winter and UTC−4 from the second Sunday in March to the first Sunday in November.
In winter: A 9-to-5 workday overlaps for 7 hours: 9:00 AM to 4:00 PM in Calgary, which is 10:00 AM to 5:00 PM in Montreal. In summer: A 9-to-5 workday overlaps for 6 hours: 9:00 AM to 3:00 PM in Calgary, which is 11:00 AM to 5:00 PM in Montreal.