Seoul to Iran
-5h 30mSeoul
KSTSOURCEIran
IRSTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and IRST on the World Map
The map below highlights the KST (Korea Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
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.
About Seoul
WikipediaSeoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
Seoul has the fastest average internet speed in the world.
Understanding the -5h 30m Gap: Seoul vs Iran
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Iran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Seoul 5 hours 30 minutes behind Iran — a difference of -5h 30m at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 3:30 AM in Iran. Midnight in Seoul is 6:30 PM in Iran. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to Iran time conversion table
| Seoul (KST) | Iran (IRST) | Day |
|---|---|---|
| 12:00 AM | 6:30 PM | previous day |
| 6:00 AM | 12:30 AM | same day |
| 7:00 AM | 1:30 AM | same day |
| 8:00 AM | 2:30 AM | same day |
| 9:00 AM | 3:30 AM | same day |
| 12:00 PM | 6:30 AM | same day |
| 3:00 PM | 9:30 AM | same day |
| 5:00 PM | 11:30 AM | same day |
| 6:00 PM | 12:30 PM | same day |
| 9:00 PM | 3:30 PM | same day |
Why people convert Seoul to Iran time
- Scheduling a call from Seoul to Iran: a 10:00 AM start in Seoul lands at 4:30 AM in Iran, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Seoul and Iran are inside the 9-to-5 working day between 2:30 PM and 5:00 PM KST time (9:00 AM–11:30 AM IRST). That is roughly 2 hours 30 minutes of usable overlap.
- Coordinating a Seoul-based team with Iran 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 KST" is unambiguous; "3 PM" across a -5h 30m gap is not.
- Block 2:30 PM–5:00 PM KST as the recurring meeting window if you work primarily from Seoul and need Iran colleagues present.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
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 Seoul and Iran
Both Seoul and Iran sit inside the 9 AM – 5 PM working day between 2:30 PM–5:00 PM KST, which is 9:00 AM–11:30 AM IRST. That gives roughly 2 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Seoul and Iran overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Seoul is 5 hours 30 minutes behind Iran (KST UTC+09:00 → IRST UTC+03:30). The shared working window is 2:30 PM–5:00 PM KST. 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 Seoul and Iran?
Seoul (KST, UTC+09:00) is 5 hours 30 minutes behind Iran (IRST, UTC+03:30). The gap is currently -5h 30m.
How do I convert Seoul time to Iran time?
Add -5h 30m to Seoul local time. For example, 9:00 AM in Seoul is 3:30 AM in Iran.
What time is it in Iran right now?
Iran 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 -5h 30m offset from Seoul.
What is the best time to call Iran from Seoul?
Call between 2:30 PM and 5:00 PM KST — that maps to 9:00 AM–11:30 AM IRST and keeps both parties inside the working day.
Which is behind, Seoul or Iran?
Seoul is 5 hours 30 minutes behind Iran. When it is 12:00 PM in Seoul it is 6:30 AM in Iran.
Do Seoul and Iran use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Iran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Asia/Seoul and Asia/Tehran.
Does daylight saving time affect the Seoul–Iran difference?
Neither zone observes daylight saving time, so the -5h 30m offset between Seoul and Iran is fixed all year.
Which other cities share Seoul's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, Seoul's zone?
KST is used in South Korea, North Korea.
Is there a day difference between Seoul and Iran?
Not normally. The -5h 30m gap only pushes the date over the previous day.
What is the time difference between Seoul and Iran?
Iran is -5h 30m from Seoul.
What timezone is Seoul in?
Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
What timezone is Iran in?
Iran operates on its local timezone.
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
Which cities are in the IRST timezone?
Major cities in the IRST timezone include Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.
What is the UTC offset for IRST?
Iran Standard Time (IRST) is at UTC+03:30. During daylight saving time, it shifts to IRDT.
What should I know about the IRST timezone?
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).
When is it midnight in Seoul, what time is it in Iran?
When it is 12:00 AM (midnight) in Seoul (KST), it is -5h 30m later in Iran (IRST).
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