Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Tehran to PET

-8h 30m

Tehran

IRSTSOURCE

Iran · UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

PET

UTC-05:00

HH03

MM30

03:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tehran

PET

12:00 AM

3:30 PM-1

2:00 AM

5:30 PM-1

4:00 AM

7:30 PM-1

6:00 AM

9:30 PM-1

8:00 AM

11:30 PM-1

10:00 AM

1:30 AM

12:00 PM

3:30 AM

2:00 PM

5:30 AM

4:00 PM

7:30 AM

6:00 PM

9:30 AM

8:00 PM

11:30 AM

10:00 PM

1:30 PM

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

IRST and PET on the World Map

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

IRST Zone

→

PET Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

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

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

Tehran to PET Time Difference – Complete Guide

Tehran runs on Iran Standard Time (IRST) at UTC+03:30. PET runs on Peru Time (PET) at UTC-05:00. That puts Tehran 8 hours 30 minutes behind PET — a difference of -8h 30m at the current offsets.

In practice, when it is 9:00 AM in Tehran it is 12:30 AM in PET. Midnight in Tehran is 3:30 PM in PET. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tehran to PET time conversion table

Tehran (IRST)	PET (PET)	Day
12:00 AM	3:30 PM	previous day
6:00 AM	9:30 PM	previous day
7:00 AM	10:30 PM	previous day
8:00 AM	11:30 PM	previous day
9:00 AM	12:30 AM	same day
12:00 PM	3:30 AM	same day
3:00 PM	6:30 AM	same day
5:00 PM	8:30 AM	same day
6:00 PM	9:30 AM	same day
9:00 PM	12:30 PM	same day

Why people convert Tehran to PET time

Scheduling a call from Tehran to PET: a 10:00 AM start in Tehran lands at 1:30 AM in PET, so you can confirm the slot without doing the arithmetic yourself.
Handling a -8h 30m gap: Tehran and PET have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in PET is 12:30 AM in Tehran.
Keeping family and friends in sync: knowing that 8:00 PM in Tehran is 11:30 AM in PET makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -8h 30m gap is not.
With a -8h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Tehran takes the early slot, the next week PET does.

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

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.

Best time to call between Tehran and PET

With a -8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. PET opens at 9:00 AM PET, which is 12:30 AM in Tehran, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Tehran and PET have no shared working hours because of the -8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

Tehran is 8 hours 30 minutes behind PET (IRST UTC+03:30 → PET UTC-05:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

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 Tehran and PET?

Tehran (IRST, UTC+03:30) is 8 hours 30 minutes behind PET (PET, UTC-05:00). The gap is currently -8h 30m.

How do I convert Tehran time to PET time?

Add -8h 30m to Tehran local time. For example, 9:00 AM in Tehran is 12:30 AM in PET.

What time is it in PET right now?

PET uses PET at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h 30m offset from Tehran.

What is the best time to call PET from Tehran?

There is no shared working-hours window because of the -8h 30m gap. The closest option is 1:00 PM in Tehran, which is 4:30 AM in PET.

Which is behind, Tehran or PET?

Tehran is 8 hours 30 minutes behind PET. When it is 12:00 PM in Tehran it is 3:30 AM in PET.

Do Tehran and PET use different time zones?

Tehran (Iran) uses IRST at UTC+03:30, while PET uses PET at UTC-05:00. The IANA identifiers are Asia/Tehran and America/Lima.

Does daylight saving time affect the Tehran–PET difference?

Neither zone observes daylight saving time, so the -8h 30m offset between Tehran and PET is fixed all year.

Which other cities share Tehran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Tehran's zone?

IRST is used in Iran.

Is there a day difference between Tehran and PET?

Not normally. The -8h 30m gap only pushes the date over the previous day.

What is the time difference between Tehran and PET?

PET is -8h 30m from Tehran.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.