IRST to Lima
-8h 30mIRST
IRSTSOURCELima
PETGreen 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 – Iran Standard Time
UTC+03:30Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.
- •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.
PET – Peru Time
UTC-05:00Peru Time (PET) is the standard time for Peru, 5 hours behind UTC.
- •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.
Comparing Time Zones: IRST and Lima
IRST runs on Iran Standard Time (IRST) at UTC+03:30. Lima runs on Peru Standard Time (PET) at UTC-05:00. That puts IRST 8 hours 30 minutes behind Lima — a difference of -8h 30m at the current offsets.
In practice, when it is 9:00 AM in IRST it is 12:30 AM in Lima. Midnight in IRST is 3:30 PM in Lima. Neither zone observes daylight saving time, so the offset between them stays constant all year.
IRST to Lima time conversion table
| IRST (IRST) | Lima (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 IRST to Lima time
- Scheduling a call from IRST to Lima: a 10:00 AM start in IRST lands at 1:30 AM in Lima, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h 30m gap: IRST and Lima 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 Lima is 12:30 AM in IRST.
- Keeping family and friends in sync: knowing that 8:00 PM in IRST is 11:30 AM in Lima 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 IRST takes the early slot, the next week Lima 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 IRST and Lima
With a -8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Lima opens at 9:00 AM PET, which is 12:30 AM in IRST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
IRST and Lima have no shared working hours because of the -8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
IRST is 8 hours 30 minutes behind Lima (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:
Frequently Asked Questions
What is the time difference between IRST and Lima?
IRST (IRST, UTC+03:30) is 8 hours 30 minutes behind Lima (PET, UTC-05:00). The gap is currently -8h 30m.
How do I convert IRST time to Lima time?
Add -8h 30m to IRST local time. For example, 9:00 AM in IRST is 12:30 AM in Lima.
What time is it in Lima right now?
Lima 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 IRST.
What is the best time to call Lima from IRST?
There is no shared working-hours window because of the -8h 30m gap. The closest option is 1:00 PM in IRST, which is 4:30 AM in Lima.
Which is behind, IRST or Lima?
IRST is 8 hours 30 minutes behind Lima. When it is 12:00 PM in IRST it is 3:30 AM in Lima.
Do IRST and Lima use different time zones?
IRST uses IRST at UTC+03:30, while Lima (Peru) uses PET at UTC-05:00. The IANA identifiers are Asia/Tehran and America/Lima.
Does daylight saving time affect the IRST–Lima difference?
Neither zone observes daylight saving time, so the -8h 30m offset between IRST and Lima is fixed all year.
Which other cities share IRST's time zone?
IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
Which countries use IRST, IRST's zone?
IRST is used in Iran.
Is there a day difference between IRST and Lima?
Not normally. The -8h 30m gap only pushes the date over the previous day.
What is the time difference between IRST and Lima?
Lima is -8h 30m from IRST.
What timezone is IRST in?
IRST operates on its local timezone.
What timezone is Lima in?
Lima operates on its local timezone.
Which countries use IRST (Iran Standard Time)?
IRST is used in Iran.
Does IRST observe daylight saving time?
Yes, IRST switches to IRDT during summer months.
What are some interesting 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).
Which cities are in the PET timezone?
Major cities in the PET timezone include Lima, Arequipa, Trujillo, Cusco, Callao.
What is the UTC offset for PET?
Peru Time (PET) is at UTC-05:00.
What should I know about the PET timezone?
Peru does not observe daylight saving time. PET is the same offset as EST (UTC-05:00).
When is it midnight in IRST, what time is it in Lima?
When it is 12:00 AM (midnight) in IRST (IRST), it is -8h 30m later in Lima (PET).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More IRST time conversions
- irst to tehran
- irst to iran
- irst to new york
- irst to london
- irst to dubai
- irst to tokyo
- irst to singapore
- irst to sydney
- irst to los angeles
- irst to paris
- irst to delhi
- irst to mumbai
- irst to berlin
- irst to hong kong
- irst to toronto
- irst to kathmandu
- new york to irst
- london to irst
- dubai to irst
- tokyo to irst
- singapore to irst
- sydney to irst
- los angeles to irst
- paris to irst
- delhi to irst
- mumbai to irst
- berlin to irst
- hong kong to irst
- toronto to irst
- kathmandu to irst
See every conversion from IRST →·See every conversion from Lima →