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).

Sri Lanka to Tehran

-2h

Sri Lanka

ISTSOURCE

UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH10

MM00

10:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Sri Lanka

Tehran

12:00 AM

10:00 PM-1

2:00 AM

12:00 AM

4:00 AM

2:00 AM

6:00 AM

4:00 AM

8:00 AM

6:00 AM

10:00 AM

8:00 AM

12:00 PM

10:00 AM

2:00 PM

12:00 PM

4:00 PM

2:00 PM

6:00 PM

4:00 PM

8:00 PM

6:00 PM

10:00 PM

8:00 PM

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

IST and IRST on the World Map

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

IST Zone

→

IRST Zone

Explore all world timezones interactively →

IST – India Standard Time

UTC+05:30

India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.

Countries in IST

IndiaSri Lanka

Major Cities in IST

MumbaiDelhiBangaloreKolkataChennaiHyderabadPuneAhmedabadColomboJaipurLucknowSurat

Key Facts about IST

•India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
•India uses a single time zone despite spanning 30° of longitude.
•IST is one of only a handful of time zones with a 30-minute offset.
•IST is the most populous single time zone in the world with over 1.4 billion people.
•The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.

Daylight Saving:No – UTC+05:30 year-round

Learn more about IST 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

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 →

Understanding the -2h Gap: Sri Lanka vs Tehran

Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Sri Lanka 2 hours behind Tehran — a difference of -2h at the current offsets.

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

Sri Lanka to Tehran time conversion table

Sri Lanka (IST)	Tehran (IRST)	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 Sri Lanka to Tehran time

Scheduling a call from Sri Lanka to Tehran: a 10:00 AM start in Sri Lanka lands at 8:00 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Sri Lanka and Tehran are inside the 9-to-5 working day between 11:00 AM and 5:00 PM IST time (9:00 AM–3:00 PM IRST). That is roughly 6 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Sri Lanka is 6:00 PM in Tehran makes it easy to avoid calling at 3 AM.

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

About IST (India Standard Time)

India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.

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 Sri Lanka and Tehran

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

Business hours overlap

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

Sri Lanka is 2 hours behind Tehran (IST UTC+05:30 → IRST UTC+03:30). The shared working window is 11:00 AM–5:00 PM IST. 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 Sri Lanka and Tehran?

Sri Lanka (IST, UTC+05:30) is 2 hours behind Tehran (IRST, UTC+03:30). The gap is currently -2h.

How do I convert Sri Lanka time to Tehran time?

Add -2h to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 7:00 AM in Tehran.

What time is it in Tehran right now?

Tehran 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 -2h offset from Sri Lanka.

What is the best time to call Tehran from Sri Lanka?

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

Which is behind, Sri Lanka or Tehran?

Sri Lanka is 2 hours behind Tehran. When it is 12:00 PM in Sri Lanka it is 10:00 AM in Tehran.

Do Sri Lanka and Tehran use different time zones?

Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Colombo and Asia/Tehran.

Does daylight saving time affect the Sri Lanka–Tehran difference?

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

Which other cities share Sri Lanka's time zone?

IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.

Which countries use IST, Sri Lanka's zone?

IST is used in India, Sri Lanka.

Is there a day difference between Sri Lanka and Tehran?

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

What is the time difference between Sri Lanka and Tehran?

Tehran is -2h from Sri Lanka.

What timezone is Sri Lanka in?

Sri Lanka operates on its local timezone.

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.