Houston to Calgary Time Difference
Calgary is 1 hour behind Houston. When it's 07:56:44 AM in Houston, it's 06:56:44 AM in Calgary.
How Many Hours Behind Is Calgary From Houston?
Calgary is 1 hour behind Houston. So Houston is 1 hour ahead of Calgary looking the other way — the same gap, described from the other end.
In practice that means a working day in Houston starts when it is already 8:00 AM in Calgary. The gap is not fixed all year: it becomes on Sunday, November 1, 2026, when Houston changes its clocks.
Best Time to Call Houston and Calgary
Both cities are inside normal business hours between 10:00 AM and 5:00 PM in Houston — that's 9:00 AM to 4:00 PM in Calgary. That's a 7-hour window, so a call fits comfortably in either side's working day.
both at work Houston only Calgary only neither — hours shown along the strip are Houston local time.
Convert a Specific Time
Pick any date and time in Houston to see the exact equivalent in Calgary.
Common Times Converted
Houston time on the left, Calgary time on the right.
Houston to Calgary: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Houston. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Houston | Calgary | Working hours |
|---|---|---|
| 12:00 AM | 11:00 PM prev day | — |
| 1:00 AM | 12:00 AM | — |
| 2:00 AM | 1:00 AM | — |
| 3:00 AM | 2:00 AM | — |
| 4:00 AM | 3:00 AM | — |
| 5:00 AM | 4:00 AM | — |
| 6:00 AM | 5:00 AM | — |
| 7:00 AM | 6:00 AM | — |
| 8:00 AM | 7:00 AM | — |
| 9:00 AM | 8:00 AM | Houston only |
| 10:00 AM | 9:00 AM | Both cities |
| 11:00 AM | 10:00 AM | Both cities |
| 12:00 PM | 11:00 AM | Both cities |
| 1:00 PM | 12:00 PM | Both cities |
| 2:00 PM | 1:00 PM | Both cities |
| 3:00 PM | 2:00 PM | Both cities |
| 4:00 PM | 3:00 PM | Both cities |
| 5:00 PM | 4:00 PM | Calgary only |
| 6:00 PM | 5:00 PM | — |
| 7:00 PM | 6:00 PM | — |
| 8:00 PM | 7:00 PM | — |
| 9:00 PM | 8:00 PM | — |
| 10:00 PM | 9:00 PM | — |
| 11:00 PM | 10:00 PM | — |
Understanding the Houston – Calgary Time Difference
Houston runs on America/Chicago, currently CDT (UTC-5:00). Calgary runs on America/Edmonton, currently MDT (UTC-6:00). The gap of 1 hour is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Houston adjusts its clocks and the difference becomes . Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States · Daylight Saving Time in Canada.
Houston today
Calgary today
Frequently Asked Questions
What is the time difference between Houston and Calgary?
Calgary is currently 1 hour behind Houston. That gap becomes on Sunday, November 1, 2026, when Houston changes its clocks.
How many hours behind is Calgary from Houston?
Calgary is 1 hour behind Houston. Looking at it the other way, Houston is 1 hour ahead of Calgary.
What time is it in Calgary when it is 9:00 AM in Houston?
When it is 9:00 AM in Houston, it is 8:00 AM in Calgary.
Is Calgary ahead of or behind Houston?
Calgary is 1 hour behind Houston. Houston reaches each point in the day first, so Calgary is still getting started while the Houston working day is finishing.
What is the best time to call between Houston and Calgary?
Between 10:00 AM and 5:00 PM Houston time, which is 9:00 AM to 4:00 PM in Calgary. Both cities are inside normal business hours during that window.
Does the time difference between Houston and Calgary change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to on Sunday, November 1, 2026.
What time zones are Houston and Calgary in?
Houston uses the America/Chicago time zone, currently CDT (UTC-5:00). Calgary uses America/Edmonton, currently MDT (UTC-6:00).