KST to EDT
-13hKST
KSTSOURCEEDT
EDTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and EDT on the World Map
The map below highlights the KST (Korea Standard Time) and EDT (Eastern Daylight 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).
EDT – Eastern Daylight Time
UTC-04:00Eastern Daylight Time (EDT) is the daylight saving time observed in the Eastern Time Zone, 4 hours behind UTC.
- •EDT is observed from the second Sunday of March to the first Sunday of November.
- •During EDT, the US East Coast is only 4 hours behind London (instead of 5).
- •Not all EST locations switch to EDT – Panama and Jamaica stay on EST year-round.
KST to EDT Time Difference – Complete Guide
KST runs on Korea Standard Time (KST) at UTC+09:00. EDT runs on Eastern Daylight Time (EDT) at UTC-04:00. That puts KST 13 hours behind EDT — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in KST it is 8:00 PM in EDT on the previous day. Midnight in KST is 11:00 AM in EDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
KST to EDT time conversion table
| KST (KST) | EDT (EDT) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | previous day |
| 6:00 AM | 5:00 PM | previous day |
| 7:00 AM | 6:00 PM | previous day |
| 8:00 AM | 7:00 PM | previous day |
| 9:00 AM | 8:00 PM | previous day |
| 12:00 PM | 11:00 PM | previous day |
| 3:00 PM | 2:00 AM | same day |
| 5:00 PM | 4:00 AM | same day |
| 6:00 PM | 5:00 AM | same day |
| 9:00 PM | 8:00 AM | same day |
Why people convert KST to EDT time
- Scheduling a call from KST to EDT: a 10:00 AM start in KST lands at 9:00 PM in EDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: KST and EDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in EDT is 8:00 PM in KST.
- Coordinating a KST-based team with EDT 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 -13h gap is not.
- With a -13h gap there is no shared 9-to-5 window, so alternate the early start: one week KST takes the early slot, the next week EDT does.
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 EDT (Eastern Daylight Time)
Eastern Daylight Time (EDT) is used during the summer months (second Sunday of March to the first Sunday of November) in the Eastern Time Zone. During EDT, clocks are advanced by one hour to take advantage of longer daylight hours. Not all locations in the Eastern Time Zone observe DST – Panama, Jamaica, and most of the Caribbean remain on EST year-round.
Best time to call between KST and EDT
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. EDT opens at 9:00 AM EDT, which is 8:00 PM in KST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
KST and EDT have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
KST is 13 hours behind EDT (KST UTC+09:00 → EDT UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
KST
Does not observe DST
EDT
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
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 EDT?
KST (KST, UTC+09:00) is 13 hours behind EDT (EDT, UTC-04:00). The gap is currently -13h.
How do I convert KST time to EDT time?
Add -13h to KST local time. For example, 9:00 AM in KST is 8:00 PM in EDT (previous day).
What time is it in EDT right now?
EDT uses EDT at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -13h offset from KST.
What is the best time to call EDT from KST?
There is no shared working-hours window because of the -13h gap. The closest option is 1:00 PM in KST, which is 12:00 AM in EDT.
Which is behind, KST or EDT?
KST is 13 hours behind EDT. When it is 12:00 PM in KST it is 11:00 PM in EDT.
Does daylight saving time affect the KST–EDT difference?
Neither zone observes daylight saving time, so the -13h offset between KST and EDT 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 EDT?
Sometimes. The -13h gap is large enough that 8:00 PM or later in KST already falls on the in EDT.
What is the time difference between KST and EDT?
EDT is -13h from KST.
What timezone is KST in?
KST operates on its local timezone.
What timezone is EDT in?
EDT operates on its local timezone.
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 EDT timezone?
Major cities in the EDT timezone include New York City, Washington D.C., Toronto, Miami, Philadelphia, Atlanta, Boston, Montreal.
What is the UTC offset for EDT?
Eastern Daylight Time (EDT) is at UTC-04:00. During daylight saving time, it shifts to EST.
What should I know about the EDT timezone?
EDT is observed from the second Sunday of March to the first Sunday of November. During EDT, the US East Coast is only 4 hours behind London (instead of 5).
When is it midnight in KST, what time is it in EDT?
When it is 12:00 AM (midnight) in KST (KST), it is -13h later in EDT (EDT).
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See every conversion from KST →·See every conversion from EDT →