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.

GST to Tehran

-0h 30m

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH11

MM30

11:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

Tehran

12:00 AM

11:30 PM-1

2:00 AM

1:30 AM

4:00 AM

3:30 AM

6:00 AM

5:30 AM

8:00 AM

7:30 AM

10:00 AM

9:30 AM

12:00 PM

11:30 AM

2:00 PM

1:30 PM

4:00 PM

3:30 PM

6:00 PM

5:30 PM

8:00 PM

7:30 PM

10:00 PM

9:30 PM

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

GST and IRST on the World Map

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

GST Zone

→

IRST Zone

Explore all world timezones interactively →

GST – Gulf Standard Time

UTC+04:00

Gulf Standard Time (GST) is used in the UAE, Oman, and other Gulf states, 4 hours ahead of UTC.

Countries in GST

UAEOmanGeorgiaAzerbaijanMauritius

Major Cities in GST

DubaiAbu DhabiMuscatBakuTbilisi

Key Facts about GST

•Dubai uses GST year-round with no daylight saving time.
•GST is 9 hours ahead of EST and 4 hours ahead of GMT.
•The Dubai Financial Market (DFM) operates on GST.

Daylight Saving:No – UTC+04:00 year-round

Learn more about GST 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 →

Time Conversion Guide: GST to Tehran

GST runs on Gulf Standard Time (GST) at UTC+04:00. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts GST 30 minutes behind Tehran — a difference of -0h 30m at the current offsets.

In practice, when it is 9:00 AM in GST it is 8:30 AM in Tehran. Midnight in GST is 11:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to Tehran time conversion table

GST (GST)	Tehran (IRST)	Day
12:00 AM	11:30 PM	previous day
6:00 AM	5:30 AM	same day
7:00 AM	6:30 AM	same day
8:00 AM	7:30 AM	same day
9:00 AM	8:30 AM	same day
12:00 PM	11:30 AM	same day
3:00 PM	2:30 PM	same day
5:00 PM	4:30 PM	same day
6:00 PM	5:30 PM	same day
9:00 PM	8:30 PM	same day

Why people convert GST to Tehran time

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

Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a -0h 30m gap is not.
Block 9:30 AM–5:00 PM GST as the recurring meeting window if you work primarily from GST and need Tehran colleagues present.

About GST (Gulf Standard Time)

Gulf Standard Time (GST) is the time zone used in the United Arab Emirates, Oman, and other Gulf states. GST does not observe daylight saving time. Dubai and Abu Dhabi, major international business and tourism hubs, operate on GST.

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 GST and Tehran

Both GST and Tehran sit inside the 9 AM – 5 PM working day between 9:30 AM–5:00 PM GST, which is 9:00 AM–4:30 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

GST and Tehran share 7 hours of working-hours overlap (9:30 AM–5:00 PM GST), so scheduling a live meeting is straightforward.

GST is 30 minutes behind Tehran (GST UTC+04:00 → IRST UTC+03:30). The shared working window is 9:30 AM–5:00 PM GST. 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 GST and Tehran?

GST (GST, UTC+04:00) is 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -0h 30m.

How do I convert GST time to Tehran time?

Add -0h 30m to GST local time. For example, 9:00 AM in GST is 8:30 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 -0h 30m offset from GST.

What is the best time to call Tehran from GST?

Call between 9:30 AM and 5:00 PM GST — that maps to 9:00 AM–4:30 PM IRST and keeps both parties inside the working day.

Which is behind, GST or Tehran?

GST is 30 minutes behind Tehran. When it is 12:00 PM in GST it is 11:30 AM in Tehran.

Do GST and Tehran use different time zones?

GST uses GST at UTC+04:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Dubai and Asia/Tehran.

Does daylight saving time affect the GST–Tehran difference?

Neither zone observes daylight saving time, so the -0h 30m offset between GST and Tehran is fixed all year.

Which other cities share GST's time zone?

GST also covers Dubai, Abu Dhabi, Muscat, Baku, Tbilisi.

Which countries use GST, GST's zone?

GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.

Is there a day difference between GST and Tehran?

Not normally. The -0h 30m gap only pushes the date over the previous day.

What is the time difference between GST and Tehran?

Tehran is -0h 30m from GST.

What timezone is GST in?

GST 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.