What is 8 AM JST in KST?
8 AM JST = 8:00 AM KST (08:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
Timezone converter
JST to KST currently uses Japan Time in Asia/Tokyo and Korean Time in Asia/Seoul as the live reference pair. Right now the gap is +0h, and the sections below break that into meeting-time shortcuts, workday overlap, DST changes, and city coverage on both sides.
Last updated Apr 22, 2026. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.
From
Japan Time
Asia/Tokyo · GMT+9 +09:00
Major markets in this grouping include Tokyo, Yokohama, Osaka, Nagoya.
To
Korean Time
Asia/Seoul · GMT+9 +09:00
Major markets in this grouping include Seoul, Busan, Pyongyang, Incheon.
Current gap
+0h
JST +09:00 vs KST +09:00
9-to-5 overlap
8h
JST 9:00 AM previous day to 5:00 PM previous day
Representative countries
Japan / South Korea and North Korea
Based on the busiest city and zone usage found in the current dataset.
JST and KST currently connect Tokyo and Seoul with a live gap of +0h. Representative coverage on the JST side is anchored by Tokyo, Yokohama, Osaka, and Nagoya, while the KST side is anchored by Seoul, Busan, Pyongyang, and Incheon.
Using a simple 9:00 AM to 5:00 PM workday on both sides, the pair shares about 8 hours of business overlap - roughly JST 9:00 AM previous day to 5:00 PM previous day, which is KST 9:00 AM previous day to 5:00 PM previous day. Most of the workday still lines up, which is helpful for live support, same-day reviews, and straightforward calendar invites.
The live gap is +0h right now, based on Asia/Tokyo at +09:00 and Asia/Seoul at +09:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
On the JST side, the current dataset is anchored by cities such as Tokyo, Japan; Yokohama, Japan; Osaka, Japan; Nagoya, Japan; Sapporo, Japan; Fukuoka, Japan. That makes this page useful for real-world coordination patterns rather than only abstract offset math.
On the KST side, the live reference set includes Seoul, South Korea; Busan, South Korea; Pyongyang, North Korea; Incheon, South Korea; Daegu, South Korea; Daejeon, South Korea. In practice, that means the conversion is tied to recognizable business, travel, and support hubs rather than a single anonymous timezone label.
Country usage on the two sides currently includes Japan for JST and South Korea and North Korea for KST. That country coverage helps explain why some pairs feel like outsourcing, logistics, gaming, finance, or travel-heavy conversions while others are more niche.
Adjust the time — digits roll like an odometer. Swap button flips the zones.
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| JST | KST | Day relation |
|---|---|---|
| 9:00 AM | 9:00 AMWed, Apr 22 | same day |
| 12:00 PM | 12:00 PMWed, Apr 22 | same day |
| 3:00 PM | 3:00 PMWed, Apr 22 | same day |
| 6:00 PM | 6:00 PMWed, Apr 22 | same day |
| 9:00 PM | 9:00 PMWed, Apr 22 | same day |
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| KST | JST | Day relation |
|---|---|---|
| 9:00 AM | 9:00 AMWed, Apr 22 | same day |
| 12:00 PM | 12:00 PMWed, Apr 22 | same day |
| 3:00 PM | 3:00 PMWed, Apr 22 | same day |
| 6:00 PM | 6:00 PMWed, Apr 22 | same day |
| 9:00 PM | 9:00 PMWed, Apr 22 | same day |
JST to KST meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 9:00 AM, while 9:00 PM lands at 9:00 PM, which makes the practical handoff window much easier to scan.
KST to JST meeting times is easiest to read as a working-day range rather than a single spot conversion. In the current snapshot, 9:00 AM lands at 9:00 AM, while 9:00 PM lands at 9:00 PM, which makes the practical handoff window much easier to scan.
These direct answers are here for the exact-intent searches people actually use, like “10 AM JST to KST” or “4 PM JST in KST”.
8 AM JST = 8:00 AM KST (08:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
9 AM JST = 9:00 AM KST (09:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
10 AM JST = 10:00 AM KST (10:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
11 AM JST = 11:00 AM KST (11:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
12 PM JST = 12:00 PM KST (12:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
1 PM JST = 1:00 PM KST (13:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
2 PM JST = 2:00 PM KST (14:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
3 PM JST = 3:00 PM KST (15:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
4 PM JST = 4:00 PM KST (16:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
5 PM JST = 5:00 PM KST (17:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
6 PM JST = 6:00 PM KST (18:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
9 PM JST = 9:00 PM KST (21:00). On today's live calendar that lands on Wed, Apr 22 in KST, which means the answer is a same day conversion rather than a static offset lookup.
The live gap is +0h right now, based on Asia/Tokyo at +09:00 and Asia/Seoul at +09:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
The most usable workday block right now is about 8 hours: JST 9:00 AM previous day to 5:00 PM previous day, which lines up with KST 9:00 AM previous day to 5:00 PM previous day.
Asia/Tokyo
GMT+9 · +09:00
Asia/Seoul
GMT+9 · +09:00
These are the busiest live references selected from the abbreviation families on this page.
| JST | KST |
|---|---|
| 09:00 | 09:00 |
| 10:00 | 10:00 |
| 11:00 | 11:00 |
| 12:00 | 12:00 |
| 13:00 | 13:00 |
| 14:00 | 14:00 |
| 15:00 | 15:00 |
| 16:00 | 16:00 |
| 17:00 | 17:00 |
| 18:00 | 18:00 |
| 19:00 | 19:00 |
| 20:00 | 20:00 |
| 21:00 | 21:00 |
| 22:00 | 22:00 |
| 23:00 | 23:00 |
| 00:00 | 00:00 |
| 01:00 | 01:00 |
| 02:00 | 02:00 |
| 03:00 | 03:00 |
| 04:00 | 04:00 |
| 05:00 | 05:00 |
| 06:00 | 06:00 |
| 07:00 | 07:00 |
| 08:00 | 08:00 |
Countries represented here include Japan.
Countries represented here include South Korea and North Korea.
Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.
Interactive converter
Move from this static pair into the full timezone converter with more cities and abbreviations.
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