MT to PET Time Converter
PET is 1 hour ahead of MT. The US Mountain states are currently on MDT (UTC-6:00), and PET is UTC-5:00.
Best Time to Call Between MT and PET
Both zones are inside normal business hours between 9:00 AM and 4:00 PM MT — that's 10:00 AM to 5:00 PM PET. That's a 7-hour window.
both at work MT only PET only neither — hours along the strip are MT.
Common Times Converted
MT on the left, PET on the right.
MT to PET: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| MT | PET | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | PET only |
| 9:00 AM | 10:00 AM | Both zones |
| 10:00 AM | 11:00 AM | Both zones |
| 11:00 AM | 12:00 PM | Both zones |
| 12:00 PM | 1:00 PM | Both zones |
| 1:00 PM | 2:00 PM | Both zones |
| 2:00 PM | 3:00 PM | Both zones |
| 3:00 PM | 4:00 PM | Both zones |
| 4:00 PM | 5:00 PM | MT only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
What MT and PET Actually Are
MT — Mountain Time
Denver, Salt Lake City, Calgary, Edmonton — and Phoenix, which does not change its clocks. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST.
Mountain Time contains the most conspicuous daylight saving exception in North America: Arizona, which has opted out since 1968.
PET — Peru Time
Lima, Arequipa, Trujillo. Standing at UTC-5:00 as written, and the region does not change its clocks, so that offset holds all year.
Peru sits at UTC-5 year-round despite spanning longitudes that would suggest otherwise, and has not used daylight saving since a short trial in the 1990s.
What This Means in Practice
This gap is not fixed
MT changes its clocks and PET does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Close enough to share a working day
At only 1 hour apart, the two working days overlap almost completely. Scheduling is barely constrained by the difference.
Major Cities in Each Zone
Cities on MT
Cities on PET
Frequently Asked Questions
What is the time difference between MT and PET?
PET is 1 hour ahead of MT. That is the live figure. Taken strictly as written, the gap between MT and PET is 2 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM MT in PET?
9:00 AM MT is 10:00 AM PET.
What are the best hours to schedule a call between MT and PET?
Between 9:00 AM and 4:00 PM MT, which is 10:00 AM to 5:00 PM PET. Both sides are inside normal business hours through that window.
Does the difference between MT and PET change during the year?
Yes. MT observes daylight saving and PET does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.