KST to Istanbul
-6hKST
KSTSOURCEIstanbul
TRTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and TRT on the World Map
The map below highlights the KST (Korea Standard Time) and TRT (Turkey 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).
TRT – Turkey Time
UTC+03:00Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.
- •Turkey has used a permanent UTC+03:00 since September 2016.
- •TRT is level with Moscow Standard Time and Arabia Standard Time all year.
- •Because Turkey kept summer time permanently, western cities see very late winter sunrises.
- •Turkey previously observed daylight saving time from 1973 to 2016.
About Istanbul
WikipediaIstanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
The Grand Bazaar is one of the world's oldest and largest covered markets with 4,000+ shops.
KST vs Istanbul: Offsets, DST and Best Call Times
KST runs on Korea Standard Time (KST) at UTC+09:00. Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. That puts KST 6 hours behind Istanbul — a difference of -6h at the current offsets.
In practice, when it is 9:00 AM in KST it is 3:00 AM in Istanbul. Midnight in KST is 6:00 PM in Istanbul. Neither zone observes daylight saving time, so the offset between them stays constant all year.
KST to Istanbul time conversion table
| KST (KST) | Istanbul (TRT) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | previous day |
| 6:00 AM | 12:00 AM | same day |
| 7:00 AM | 1:00 AM | same day |
| 8:00 AM | 2:00 AM | same day |
| 9:00 AM | 3:00 AM | same day |
| 12:00 PM | 6:00 AM | same day |
| 3:00 PM | 9:00 AM | same day |
| 5:00 PM | 11:00 AM | same day |
| 6:00 PM | 12:00 PM | same day |
| 9:00 PM | 3:00 PM | same day |
Why people convert KST to Istanbul time
- Scheduling a call from KST to Istanbul: a 10:00 AM start in KST lands at 4:00 AM in Istanbul, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both KST and Istanbul are inside the 9-to-5 working day between 3:00 PM and 5:00 PM KST time (9:00 AM–11:00 AM TRT). That is roughly 2 hours of usable overlap.
- Booking travel or deliveries: tracking Istanbul local time against KST keeps pickup windows and arrival estimates honest across the -6h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -6h gap is not.
- Block 3:00 PM–5:00 PM KST as the recurring meeting window if you work primarily from KST and need Istanbul 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 TRT (Turkey Time)
Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.
Best time to call between KST and Istanbul
Both KST and Istanbul sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM KST, which is 9:00 AM–11:00 AM TRT. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
KST and Istanbul overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
KST is 6 hours behind Istanbul (KST UTC+09:00 → TRT UTC+03:00). The shared working window is 3:00 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 KST and Istanbul?
KST (KST, UTC+09:00) is 6 hours behind Istanbul (TRT, UTC+03:00). The gap is currently -6h.
How do I convert KST time to Istanbul time?
Add -6h to KST local time. For example, 9:00 AM in KST is 3:00 AM in Istanbul.
What time is it in Istanbul right now?
Istanbul uses TRT at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from KST.
What is the best time to call Istanbul from KST?
Call between 3:00 PM and 5:00 PM KST — that maps to 9:00 AM–11:00 AM TRT and keeps both parties inside the working day.
Which is behind, KST or Istanbul?
KST is 6 hours behind Istanbul. When it is 12:00 PM in KST it is 6:00 AM in Istanbul.
Do KST and Istanbul use different time zones?
KST uses KST at UTC+09:00, while Istanbul (Turkey) uses TRT at UTC+03:00. The IANA identifiers are Asia/Seoul and Europe/Istanbul.
Does daylight saving time affect the KST–Istanbul difference?
Neither zone observes daylight saving time, so the -6h offset between KST and Istanbul is fixed all year.
Which other cities share KST's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, KST's zone?
KST is used in South Korea, North Korea.
Is there a day difference between KST and Istanbul?
Not normally. The -6h gap only pushes the date over the previous day.
What is the time difference between KST and Istanbul?
Istanbul is -6h from KST.
What timezone is KST in?
KST operates on its local timezone.
What timezone is Istanbul in?
Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
What are the business hours in Istanbul?
Standard business hours in Istanbul are 9:00 AM - 6:00 PM TRT.
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 TRT timezone?
Major cities in the TRT timezone include Istanbul, Ankara, Izmir, Bursa, Antalya.
What is the UTC offset for TRT?
Turkey Time (TRT) is at UTC+03:00.
What should I know about the TRT timezone?
Turkey has used a permanent UTC+03:00 since September 2016. TRT is level with Moscow Standard Time and Arabia Standard Time all year.
When is it midnight in KST, what time is it in Istanbul?
When it is 12:00 AM (midnight) in KST (KST), it is -6h later in Istanbul (TRT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More KST time conversions
- kst to seoul
- kst to south korea
- kst to new york
- kst to london
- kst to dubai
- kst to tokyo
- kst to singapore
- kst to sydney
- kst to los angeles
- kst to paris
- kst to delhi
- kst to mumbai
- kst to berlin
- kst to hong kong
- kst to toronto
- kst to kathmandu
- new york to kst
- london to kst
- dubai to kst
- tokyo to kst
- singapore to kst
- sydney to kst
- los angeles to kst
- paris to kst
- delhi to kst
- mumbai to kst
- berlin to kst
- hong kong to kst
- toronto to kst
- kathmandu to kst
See every conversion from KST →·See every conversion from Istanbul →