Convert time from KST to JST. Enter any time to see the equivalent JST time, compare current KST and JST times side by side, and find overlapping business hours for calls and meetings.
Use this KST to JST converter to compare South Korea and Japan time, check the 0 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM KST / 9:00 AM JST.
Converting between Korea Standard Time and Japan 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 Korea Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current kst time instantly, or use "+1h" to step forward and compare.
The equivalent Japan Standard Time (UTC +9) time appears immediately. Since jst is 0 hours behind of kst, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the jst 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 South Korea suggests 9:00 AM kst, that's 9:00 AM jst. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night kst times can land on a different date in jst 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 kst–jst 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 kst. Convert the event time to jst 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.
Korea Standard Time to Japan Standard Time full day schedule
| Korea Standard Time | Japan 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 kst 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 Japan Standard Time. Use these pages when scheduling with Japan from a different region.
