Convert time from JST to KST. Enter any time to see the equivalent KST time, compare current JST and KST times side by side, and find overlapping business hours for calls and meetings.
Use this JST to KST converter to compare Japan and South Korea time, check the 0 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM JST / 9:00 AM KST.
Converting between Japan Standard Time and Korea Standard Time means no offset adjustment — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Japan Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current jst time instantly, or use "+1h" to step forward and compare.
The equivalent Korea Standard Time (UTC +9) time appears immediately. Since kst is 0 hours behind of jst, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the kst result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
When someone in Japan suggests 9:00 AM jst, that's 9:00 AM kst. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night jst times can land on a different date in kst because of the 0 hours offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the jst–kst gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in jst. Convert the event time to kst so you know exactly when to tune in — since both zones share the same offset, no conversion is needed but this tool confirms it instantly.
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Korea Standard Time full day schedule
| Japan Standard Time | Korea Standard Time |
|---|---|
| 12:00 AM |
12:00 AM
|
| 1:00 AM |
1:00 AM
|
| 2:00 AM |
2:00 AM
|
| 3:00 AM |
3:00 AM
|
| 4:00 AM |
4:00 AM
|
| 5:00 AM |
5:00 AM
|
| 6:00 AM |
6:00 AM
|
| 7:00 AM |
7:00 AM
|
| 8:00 AM |
8:00 AM
|
| 9:00 AM |
9:00 AM
|
| 10:00 AM |
10:00 AM
|
| 11:00 AM |
11:00 AM
|
| 12:00 PM |
12:00 PM
|
| 1:00 PM |
1:00 PM
|
| 2:00 PM |
2:00 PM
|
| 3:00 PM |
3:00 PM
|
| 4:00 PM |
4:00 PM
|
| 5:00 PM |
5:00 PM
|
| 6:00 PM |
6:00 PM
|
| 7:00 PM |
7:00 PM
|
| 8:00 PM |
8:00 PM
|
| 9:00 PM |
9:00 PM
|
| 10:00 PM |
10:00 PM
|
| 11:00 PM |
11:00 PM
|
Japan — one of the few large economies that has no DST, so JST is JST year-round (UTC+9). Business hours 9 AM – 6 PM JST with strong presence-based culture (staying past 7 PM is common). Same offset as Korean Standard Time (KST).
Explore more jst conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Find the time difference from any major zone into Korea Standard Time. Use these pages when scheduling with South Korea from a different region.
