Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

PET to MST

-2h

PET

PETSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

MST

UTC-06:00☀ DST active

HH10

MM00

10:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

PET

MST

12:00 AM

11:00 PM-1

2:00 AM

1:00 AM

4:00 AM

3:00 AM

6:00 AM

5:00 AM

8:00 AM

7:00 AM

10:00 AM

9:00 AM

12:00 PM

11:00 AM

2:00 PM

1:00 PM

4:00 PM

3:00 PM

6:00 PM

5:00 PM

8:00 PM

7:00 PM

10:00 PM

9:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

PET and MST on the World Map

The map below highlights the PET (Peru Time) and MST (Mountain Standard Time) timezone regions across the globe.

PET Zone

→

MST Zone

Explore all world timezones interactively →

PET – Peru Time

UTC-05:00

Peru Time (PET) is the standard time for Peru, 5 hours behind UTC.

Countries in PET

Peru

Major Cities in PET

LimaArequipaTrujilloCuscoCallao

Key Facts about PET

•Peru does not observe daylight saving time.
•PET is the same offset as EST (UTC-05:00).
•Lima is the 5th largest city in the Americas.

Daylight Saving:No – UTC-05:00 year-round

Learn more about PET on Wikipedia

MST – Mountain Standard Time

UTC-07:00

Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.

Countries in MST

United States (Mountain)Canada (Alberta)Mexico (Chihuahua, Sonora)

Major Cities in MST

DenverPhoenixSalt Lake CityCalgaryEdmontonAlbuquerqueEl PasoTucsonBoiseCiudad Juárez

Key Facts about MST

•Arizona does not observe daylight saving time, staying on MST year-round.
•The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
•Denver, the 'Mile High City', is the largest city fully in MST.
•MST covers 6 US states entirely and parts of several others.

Daylight Saving:Yes – switches to MDT

Learn more about MST on Wikipedia

Everything You Need to Know About PET and MST Time

PET runs on Peru Time (PET) at UTC-05:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts PET 2 hours behind MST — a difference of -2h at the current offsets.

In practice, when it is 9:00 AM in PET it is 7:00 AM in MST. Midnight in PET is 10:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

PET to MST time conversion table

PET (PET)	MST (MST)	Day
12:00 AM	10:00 PM	previous day
6:00 AM	4:00 AM	same day
7:00 AM	5:00 AM	same day
8:00 AM	6:00 AM	same day
9:00 AM	7:00 AM	same day
12:00 PM	10:00 AM	same day
3:00 PM	1:00 PM	same day
5:00 PM	3:00 PM	same day
6:00 PM	4:00 PM	same day
9:00 PM	7:00 PM	same day

Why people convert PET to MST time

Scheduling a call from PET to MST: a 10:00 AM start in PET lands at 8:00 AM in MST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both PET and MST are inside the 9-to-5 working day between 11:00 AM and 5:00 PM PET time (9:00 AM–3:00 PM MST). That is roughly 6 hours of usable overlap.
Watching a live event or market open: PET viewers need 7:00 AM in MST to catch a 9:00 AM start there, and 2:00 AM if the event is anchored to PET.

Always state the zone abbreviation, not just the hour. "3:00 PM PET" is unambiguous; "3 PM" across a -2h gap is not.
Block 11:00 AM–5:00 PM PET as the recurring meeting window if you work primarily from PET and need MST colleagues present.

About PET (Peru Time)

Peru Time (PET) is the time zone used throughout Peru. Peru does not observe daylight saving time. PET shares the same offset as EST (UTC-05:00). Lima, the capital, is the economic center of Peru.

About MST (Mountain Standard Time)

Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).

Best time to call between PET and MST

Both PET and MST sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM PET, which is 9:00 AM–3:00 PM MST. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

PET and MST share 6 hours of working-hours overlap (11:00 AM–5:00 PM PET), so scheduling a live meeting is straightforward.

PET is 2 hours behind MST (PET UTC-05:00 → MST UTC-07:00). The shared working window is 11:00 AM–5:00 PM PET. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

PET

Does not observe DST

MST

☀ Currently in DST

Standard: UTC-07:00 · DST: UTC-06:00

Clocks fall back on Sun, Nov 1, 2026

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between PET and MST?

PET (PET, UTC-05:00) is 2 hours behind MST (MST, UTC-07:00). The gap is currently -2h.

How do I convert PET time to MST time?

Add -2h to PET local time. For example, 9:00 AM in PET is 7:00 AM in MST.

What time is it in MST right now?

MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h offset from PET.

What is the best time to call MST from PET?

Call between 11:00 AM and 5:00 PM PET — that maps to 9:00 AM–3:00 PM MST and keeps both parties inside the working day.

Which is behind, PET or MST?

PET is 2 hours behind MST. When it is 12:00 PM in PET it is 10:00 AM in MST.

Does daylight saving time affect the PET–MST difference?

Neither zone observes daylight saving time, so the -2h offset between PET and MST is fixed all year.

Which other cities share PET's time zone?

PET also covers Lima, Arequipa, Trujillo, Cusco, Callao.

Which countries use PET, PET's zone?

PET is used in Peru.

Is there a day difference between PET and MST?

Not normally. The -2h gap only pushes the date over the previous day.

What is the time difference between PET and MST?

MST is -2h from PET.

What timezone is PET in?

PET operates on its local timezone.

What timezone is MST in?

MST operates on its local timezone.

Which countries use PET (Peru Time)?

PET is used in Peru.

Does PET observe daylight saving time?

No, PET does not observe daylight saving time and remains at UTC-05:00 year-round.

What are some interesting facts about PET?

Peru does not observe daylight saving time. PET is the same offset as EST (UTC-05:00).

Which cities are in the MST timezone?

Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.

What is the UTC offset for MST?

Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.

What should I know about the MST timezone?

Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.