What's the current time difference between KST and JST?

Right now, JST (JST · Japan Standard Time) is same time relative to KST (KST · Korea Standard Time). The number is live and reflects the current daylight-saving status of both zones.

Does this converter account for daylight saving time?

Yes. The math is done against IANA's tz database via Intl.DateTimeFormat, so DST shifts in either zone show up immediately at the transition. Around DST boundaries the conversion can move by an hour from one week to the next — this page always reflects the current rule.

Why does the TO column sometimes show "+1d" or "−1d"?

When the KST hour lands on a different calendar day in JST, we flag it so you don't accidentally schedule a meeting on the wrong date. KST 11 PM is often the next day in eastern-hemisphere zones, for example.

How do I schedule a meeting that works for both zones?

Look at the row highlighted lume green — that's the longest contiguous block where both KST and JST are in standard working hours (9 AM–5 PM local). Open the planner from the link above to lock a specific time and share a DST-stable link with the other party.

KST to JST

KST · Korea Standard Time ↔ JST · Japan Standard Time. Right now, JST is same time relative to KST. DST is honored live.

From

KST

—

JST

—

00:00KST hour of day23:30

Live offset

same time

KST (May 24) ↔ JST (May 24)

If KST or JST just shifted for daylight saving, that's already reflected.

Best meeting overlap

9:00 AM – 4:00 PM

KST time. Equivalent JST: 9:00 AM – 4:00 PM

Working hours = 9 AM – 5 PM in each zone.

Hour-by-hour

KST → JST, every hour

KST · May 24JST · May 24

12:00 AM12:00 AM
1:00 AM1:00 AM
2:00 AM2:00 AM
3:00 AM3:00 AM
4:00 AM4:00 AM
5:00 AM5:00 AM
6:00 AM6:00 AM
7:00 AM7:00 AM
8:00 AM8:00 AM
9:00 AM9:00 AM
10:00 AM10:00 AM
11:00 AM11:00 AM
12:00 PM12:00 PM
1:00 PM1:00 PM
2:00 PM2:00 PM
3:00 PM3:00 PM
4:00 PM4:00 PM
5:00 PM5:00 PM
6:00 PM6:00 PM
7:00 PM7:00 PM
8:00 PM8:00 PM
9:00 PM9:00 PM
10:00 PM10:00 PM
11:00 PM11:00 PM

Both zones in working hours±1d = the TO side lands on a different calendar day

FAQ

KST ↔ JST, questions answered

What's the current time difference between KST and JST?: Right now, JST (JST · Japan Standard Time) is same time relative to KST (KST · Korea Standard Time). The number is live and reflects the current daylight-saving status of both zones.
Does this converter account for daylight saving time?: Yes. The math is done against IANA's tz database via Intl.DateTimeFormat, so DST shifts in either zone show up immediately at the transition. Around DST boundaries the conversion can move by an hour from one week to the next — this page always reflects the current rule.
Why does the TO column sometimes show "+1d" or "−1d"?: When the KST hour lands on a different calendar day in JST, we flag it so you don't accidentally schedule a meeting on the wrong date. KST 11 PM is often the next day in eastern-hemisphere zones, for example.
How do I schedule a meeting that works for both zones?: Look at the row highlighted lume green — that's the longest contiguous block where both KST and JST are in standard working hours (9 AM–5 PM local). Open the planner from the link above to lock a specific time and share a DST-stable link with the other party.

Reverse — JST to KST Open in planner