What is 8 AM KST in JST?
8 AM KST = 8:00 AM JST (08:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
Timezone converter
KST to JST currently uses Korean Time in Asia/Seoul and Japan Time in Asia/Tokyo 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
Korean Time
Asia/Seoul · GMT+9 +09:00
Major markets in this grouping include Seoul, Busan, Pyongyang, Incheon.
To
Japan Time
Asia/Tokyo · GMT+9 +09:00
Major markets in this grouping include Tokyo, Yokohama, Osaka, Nagoya.
Current gap
+0h
KST +09:00 vs JST +09:00
9-to-5 overlap
8h
KST 9:00 AM previous day to 5:00 PM previous day
Representative countries
South Korea and North Korea / Japan
Based on the busiest city and zone usage found in the current dataset.
KST and JST currently connect Seoul and Tokyo with a live gap of +0h. Representative coverage on the KST side is anchored by Seoul, Busan, Pyongyang, and Incheon, while the JST side is anchored by Tokyo, Yokohama, Osaka, and Nagoya.
Using a simple 9:00 AM to 5:00 PM workday on both sides, the pair shares about 8 hours of business overlap - roughly KST 9:00 AM previous day to 5:00 PM previous day, which is JST 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/Seoul at +09:00 and Asia/Tokyo at +09:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
On the KST side, the current dataset is anchored by cities such as Seoul, South Korea; Busan, South Korea; Pyongyang, North Korea; Incheon, South Korea; Daegu, South Korea; Daejeon, South Korea. That makes this page useful for real-world coordination patterns rather than only abstract offset math.
On the JST side, the live reference set includes Tokyo, Japan; Yokohama, Japan; Osaka, Japan; Nagoya, Japan; Sapporo, Japan; Fukuoka, Japan. 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 South Korea and North Korea for KST and Japan for JST. 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.
| KST | JST | Day relation |
|---|---|---|
| 9:00 AM | 9:00 AMThu, Apr 23 | same day |
| 12:00 PM | 12:00 PMThu, Apr 23 | same day |
| 3:00 PM | 3:00 PMThu, Apr 23 | same day |
| 6:00 PM | 6:00 PMThu, Apr 23 | same day |
| 9:00 PM | 9:00 PMThu, Apr 23 | same day |
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 AMThu, Apr 23 | same day |
| 12:00 PM | 12:00 PMThu, Apr 23 | same day |
| 3:00 PM | 3:00 PMThu, Apr 23 | same day |
| 6:00 PM | 6:00 PMThu, Apr 23 | same day |
| 9:00 PM | 9:00 PMThu, Apr 23 | same day |
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.
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.
These direct answers are here for the exact-intent searches people actually use, like “10 AM KST to JST” or “4 PM KST in JST”.
8 AM KST = 8:00 AM JST (08:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
9 AM KST = 9:00 AM JST (09:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
10 AM KST = 10:00 AM JST (10:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
11 AM KST = 11:00 AM JST (11:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
12 PM KST = 12:00 PM JST (12:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
1 PM KST = 1:00 PM JST (13:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
2 PM KST = 2:00 PM JST (14:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
3 PM KST = 3:00 PM JST (15:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
4 PM KST = 4:00 PM JST (16:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
5 PM KST = 5:00 PM JST (17:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
6 PM KST = 6:00 PM JST (18:00). On today's live calendar that lands on Thu, Apr 23 in JST, which means the answer is a same day conversion rather than a static offset lookup.
9 PM KST = 9:00 PM JST (21:00). On today's live calendar that lands on Thu, Apr 23 in JST, 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/Seoul at +09:00 and Asia/Tokyo 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: KST 9:00 AM previous day to 5:00 PM previous day, which lines up with JST 9:00 AM previous day to 5:00 PM previous day.
Asia/Seoul
GMT+9 · +09:00
Asia/Tokyo
GMT+9 · +09:00
These are the busiest live references selected from the abbreviation families on this page.
| KST | JST |
|---|---|
| 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 South Korea and North Korea.
Countries represented here include Japan.
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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