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).

MSK to IRST

+0h 30m

MSK

MSKSOURCE

UTC+03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH12

MM30

12:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

MSK

IRST

12:00 AM

12:30 AM

2:00 AM

2:30 AM

4:00 AM

4:30 AM

6:00 AM

6:30 AM

8:00 AM

8:30 AM

10:00 AM

10:30 AM

12:00 PM

12:30 PM

2:00 PM

2:30 PM

4:00 PM

4:30 PM

6:00 PM

6:30 PM

8:00 PM

8:30 PM

10:00 PM

10:30 PM

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

MSK and IRST on the World Map

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

MSK Zone

→

IRST Zone

Explore all world timezones interactively →

MSK – Moscow Standard Time

UTC+03:00

Moscow Standard Time (MSK) is the time zone for Moscow and western Russia, 3 hours ahead of UTC.

Countries in MSK

Russia (Moscow, St. Petersburg, western regions)

Major Cities in MSK

MoscowSt. PetersburgVolgogradNizhny NovgorodKazanSamaraRostov-on-Don

Key Facts about MSK

•All Russian train timetables use Moscow Time, regardless of location.
•Russia abolished daylight saving time in 2011.
•Moscow is the most populous city in Europe with over 12 million residents.
•MSK shares the offset with Saudi Arabia (AST) and East Africa (EAT).

Daylight Saving:No – UTC+03:00 year-round

Learn more about MSK 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

Comparing Time Zones: MSK and IRST

MSK runs on Moscow Standard Time (MSK) at UTC+03:00. IRST runs on Iran Standard Time (IRST) at UTC+03:30. That puts MSK 30 minutes ahead of IRST — a difference of +0h 30m at the current offsets.

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

MSK to IRST time conversion table

MSK (MSK)	IRST (IRST)	Day
12:00 AM	12:30 AM	same day
6:00 AM	6:30 AM	same day
7:00 AM	7:30 AM	same day
8:00 AM	8:30 AM	same day
9:00 AM	9:30 AM	same day
12:00 PM	12:30 PM	same day
3:00 PM	3:30 PM	same day
5:00 PM	5:30 PM	same day
6:00 PM	6:30 PM	same day
9:00 PM	9:30 PM	same day

Why people convert MSK to IRST time

Scheduling a call from MSK to IRST: a 10:00 AM start in MSK lands at 10:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both MSK and IRST are inside the 9-to-5 working day between 9:00 AM and 4:30 PM MSK time (9:30 AM–5:00 PM IRST). That is roughly 7 hours 30 minutes of usable overlap.
Booking travel or deliveries: tracking IRST local time against MSK keeps pickup windows and arrival estimates honest across the +0h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM MSK" is unambiguous; "3 PM" across a +0h 30m gap is not.
Block 9:00 AM–4:30 PM MSK as the recurring meeting window if you work primarily from MSK and need IRST colleagues present.

About MSK (Moscow Standard Time)

Moscow Standard Time (MSK) is the time zone used in Moscow, St. Petersburg, and much of western Russia. Russia abolished DST in 2011, so MSK is observed year-round. MSK is also the reference time for Russian railways – all train schedules in Russia are given in Moscow Time regardless of the actual local time zone.

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 MSK and IRST

Both MSK and IRST sit inside the 9 AM – 5 PM working day between 9:00 AM–4:30 PM MSK, which is 9:30 AM–5:00 PM IRST. That gives roughly 7 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

MSK and IRST share 7 hours of working-hours overlap (9:00 AM–4:30 PM MSK), so scheduling a live meeting is straightforward.

MSK is 30 minutes ahead of IRST (MSK UTC+03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–4:30 PM MSK. 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 MSK and IRST?

MSK (MSK, UTC+03:00) is 30 minutes ahead of IRST (IRST, UTC+03:30). The gap is currently +0h 30m.

How do I convert MSK time to IRST time?

Add +0h 30m to MSK local time. For example, 9:00 AM in MSK is 9:30 AM 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 +0h 30m offset from MSK.