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.

PET to IRST

+8h 30m

PET

PETSOURCE

UTC-05:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH08

MM30

20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

PET

IRST

12:00 AM

8:30 AM

2:00 AM

10:30 AM

4:00 AM

12:30 PM

6:00 AM

2:30 PM

8:00 AM

4:30 PM

10:00 AM

6:30 PM

12:00 PM

8:30 PM

2:00 PM

10:30 PM

4:00 PM

12:30 AM+1

6:00 PM

2:30 AM+1

8:00 PM

4:30 AM+1

10:00 PM

6:30 AM+1

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

PET and IRST on the World Map

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

PET Zone

→

IRST 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

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

Everything You Need to Know About PET and IRST Time

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

In practice, when it is 9:00 AM in PET it is 5:30 PM in IRST. Midnight in PET is 8:30 AM in IRST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

PET to IRST time conversion table

PET (PET)	IRST (IRST)	Day
12:00 AM	8:30 AM	same day
6:00 AM	2:30 PM	same day
7:00 AM	3:30 PM	same day
8:00 AM	4:30 PM	same day
9:00 AM	5:30 PM	same day
12:00 PM	8:30 PM	same day
3:00 PM	11:30 PM	same day
5:00 PM	1:30 AM	next day
6:00 PM	2:30 AM	next day
9:00 PM	5:30 AM	next day

Why people convert PET to IRST time

Scheduling a call from PET to IRST: a 10:00 AM start in PET lands at 6:30 PM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h 30m gap: PET and IRST 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 IRST is 5:30 PM in PET.
Coordinating a PET-based team with IRST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM PET" 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 PET takes the early slot, the next week IRST does.

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 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.

Best time to call between PET and IRST

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

Business hours overlap

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

PET is 8 hours 30 minutes ahead of IRST (PET UTC-05:00 → IRST UTC+03:30). 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 PET and IRST?

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

How do I convert PET time to IRST time?

Add +8h 30m to PET local time. For example, 9:00 AM in PET is 5:30 PM in IRST.

What time is it in IRST right now?

IRST uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h 30m offset from PET.