Time in Korea (South Korea)
Korea Standard Time (KST, UTC+9) explained — US time differences, KOSPI trading hours, K-pop streaming times, and how to schedule calls with Seoul.
Cities in South Korea
Korea Standard Time (KST) — UTC+9, No Daylight Saving
South Korea operates on Korea Standard Time (KST), permanently set at UTC+9. Like neighboring Japan, South Korea abolished daylight saving time in 1988 after a brief trial period and has never reinstated it. This means KST never changes — the offset is a fixed UTC+9, 365 days a year.
An interesting geographic note: South Korea's westernmost point is actually closer to UTC+8 by the sun's position, but the country uses UTC+9 to align with Japan and the broader Northeast Asian economic zone. North Korea briefly switched to UTC+8:30 in 2015 (calling it Pyongyang Time) before reverting to UTC+9 in 2018 to facilitate inter-Korean cooperation — so the entire Korean peninsula now shares KST.
| Detail | Value |
|---|---|
| Time Zone Name | Korea Standard Time (KST) |
| UTC Offset | UTC+9 |
| Daylight Saving Time | None — clocks never change |
| ISO Country Code | KR |
| Same offset as | Japan (JST), Yakutsk (Russia) |
South Korea's capital Seoul is covered in depth on our time in Seoul page. For comparison with the identical UTC+9 timezone in Japan, visit our time in Japan page.
Korea vs. US Time Differences
KST (UTC+9) sits far ahead of all US time zones. The exact gap depends on whether the US is observing daylight saving time — South Korea's clocks never move, so the difference shrinks by one hour each spring when the US moves forward.
US Standard Time (approximately November to March):
| US City | US Time Zone | Hours Korea is Ahead |
|---|---|---|
| New York | EST (UTC−5) | 14 hours |
| Chicago | CST (UTC−6) | 15 hours |
| Denver | MST (UTC−7) | 16 hours |
| Los Angeles | PST (UTC−8) | 17 hours |
US Daylight Saving Time (approximately March to November):
| US City | US Time Zone | Hours Korea is Ahead |
|---|---|---|
| New York | EDT (UTC−4) | 13 hours |
| Chicago | CDT (UTC−5) | 14 hours |
| Denver | MDT (UTC−6) | 15 hours |
| Los Angeles | PDT (UTC−7) | 16 hours |
Practical day-crossing examples:
- Monday 9:00 AM in New York (EST) = Monday 11:00 PM in Seoul
- Monday 3:00 PM in Los Angeles (PST) = Tuesday 8:00 AM in Seoul — already the next day
- Friday 6:00 PM in New York = Saturday 8:00 AM in Seoul — Korea's weekend morning
For live New York time to calculate the current KST offset, visit our New York time page.
Seoul–New York Hourly Time Comparison
The following table maps each hour of the New York day to its Seoul (KST) equivalent. This is useful for scheduling business calls, K-pop live streams, gaming events, and e-sports tournaments.
| New York (EST, UTC−5) | Seoul (KST, UTC+9) | Seoul Day | Best For |
|---|---|---|---|
| 12:00 AM | 2:00 PM | Same day | Seoul afternoon meetings |
| 3:00 AM | 5:00 PM | Same day | Seoul late afternoon |
| 6:00 AM | 8:00 PM | Same day | Seoul evening (good for calls) |
| 7:00 AM | 9:00 PM | Same day | Seoul late evening (last chance) |
| 9:00 AM | 11:00 PM | Same day | Seoul near midnight |
| 10:00 AM | 12:00 AM | Next day | Seoul midnight |
| 12:00 PM | 2:00 AM | Next day | Seoul deep night |
| 3:00 PM | 5:00 AM | Next day | Seoul pre-dawn |
| 5:00 PM | 7:00 AM | Next day | Seoul morning |
| 6:00 PM | 8:00 AM | Next day | Seoul business opens |
| 9:00 PM | 11:00 AM | Next day | Seoul late morning |
| 11:00 PM | 1:00 PM | Next day | Seoul afternoon |
During US DST (EDT, UTC−4), the gap narrows to 13 hours — add 1 hour to Seoul column above.
The best calling window: 6:00–8:00 AM Eastern puts you at 8:00–10:00 PM Seoul time — Korean office workers often stay late, making early morning US calls surprisingly productive. From Los Angeles, calling at 4:00–6:00 PM PST reaches Seoul at 9:00–11:00 AM the next morning — perfect timing.
KOSPI & Korea Exchange Hours for US Investors
The Korea Exchange (KRX) operates both the KOSPI (Korea Composite Stock Price Index, large-cap) and KOSDAQ (tech and growth companies) markets. KOSPI is a key Asian benchmark watched by global investors, particularly those tracking Samsung, Hyundai, SK Hynix, and LG.
Korea Exchange Trading Hours (KST):
| Session | Open (KST) | Close (KST) |
|---|---|---|
| Regular trading | 9:00 AM | 3:30 PM |
| Pre-market | 8:30 AM | 8:59 AM |
| After-hours | 3:40 PM | 6:00 PM |
Converted to US Eastern Time:
| KRX Event | EST (Nov–Mar) | EDT (Mar–Nov) |
|---|---|---|
| Pre-market open (8:30 AM KST) | 6:30 PM (prev. evening) | 7:30 PM (prev. evening) |
| Regular open (9:00 AM KST) | 7:00 PM (prev. evening) | 8:00 PM (prev. evening) |
| Regular close (3:30 PM KST) | 1:30 AM | 2:30 AM |
| After-hours close (6:00 PM KST) | 4:00 AM | 5:00 AM |
Key stocks US investors track on KOSPI:
- Samsung Electronics (005930.KS) — the world's largest memory chip and smartphone maker
- SK Hynix (000660.KS) — major DRAM/NAND supplier to Apple and Nvidia
- Hyundai Motor (005380.KS) — increasingly relevant to US EV market
- Kakao (035720.KS) — Korea's dominant digital platform
Semiconductor investors particularly watch KOSPI overnight: Korean chip stocks often anticipate moves in US names like Nvidia, Micron, and Applied Materials. The KRX close (~1:30 AM EST) feeds into pre-market positioning in New York.
K-Pop & K-Drama Live Streaming Times for US Fans
South Korea's global entertainment industry — collectively known as Hallyu (Korean Wave) — has made real-time fan participation across time zones a major phenomenon. From BTS concerts to BLACKPINK fan meets to live music show broadcasts, US fans regularly stay up late (or wake up early) to watch events in real time.
Key Korean Entertainment Time Slots (KST) and US Equivalents:
| Korean Event | Typical KST Time | New York (EST) | Los Angeles (PST) |
|---|---|---|---|
| Music Bank (KBS, Fri) | 5:10 PM KST | 3:10 AM Fri | 12:10 AM Fri |
| Inkigayo (SBS, Sun) | 4:05 PM KST | 2:05 AM Sun | 11:05 PM Sat |
| Show! Music Core (MBC, Sat) | 3:30 PM KST | 1:30 AM Sat | 10:30 PM Fri |
| VLIVE / Weverse fan livestreams | Varies, often 10 PM – midnight KST | 8:00–10:00 AM EST | 5:00–7:00 AM PST |
| Major award shows (MAMA, MMA, GDA) | 6:00–8:00 PM KST | 4:00–6:00 AM EST | 1:00–3:00 AM PST |
K-Drama premiere schedules: Most major Korean dramas air on weekday evenings at 9:00–10:00 PM KST, which translates to 7:00–8:00 AM EST (morning) or 4:00–5:00 AM PST. Streaming platforms like Netflix Korea typically release episodes simultaneously or within hours for international audiences. However, live-watch fandoms on platforms like YouTube and Weverse stream events in real time, meaning US East Coast fans need to be up by 7 AM to join the Korean prime-time experience.
E-Sports: South Korea is the birthplace of competitive StarCraft and League of Legends. The LCK (League of Legends Champions Korea) season typically runs matches on weekday afternoons KST — 4:00–8:00 PM KST, corresponding to 2:00–6:00 AM EST. Fans who want to watch LCK live rather than VOD should expect late-night viewing sessions.
Best Times to Call South Korea from the US:
| Your US Time | Korean Time (KST) | Suitable? |
|---|---|---|
| 6:00 AM EST | 8:00 PM KST | Yes — Korean evening |
| 7:00 AM EST | 9:00 PM KST | Yes — still productive |
| 5:00 PM PST | 10:00 AM KST (next day) | Excellent — Korean business hours |
| 7:00 PM PST | 12:00 PM KST (next day) | Excellent — Korean lunch break |
For all things Korean time, also check our dedicated time in Seoul page covering the capital's specific daily schedules.
