What is the time difference between KST and JST?

Japan Standard Time (JST) is 0 hours the same as Korea Standard Time (KST). KST uses a UTC offset of UTC+9, while JST uses UTC+9. For example, when it's 9:00 AM in KST, it's 9:00 AM in JST. This difference remains constant year-round since neither timezone observes daylight saving time. Use the conversion table above to see the exact time for each hour of the day.

How do I convert KST to JST?

KST and JST share the same UTC offset (UTC+9), so no conversion is needed. 9:00 AM KST is 9:00 AM JST. This makes scheduling meetings and calls between these two timezones straightforward since there is no time difference to account for. The conversion table above confirms that every hour maps directly.

What time is it in JST when it's noon in KST?

When it's 12:00 PM (noon) in KST, it's also 12:00 PM in JST since both timezones share the same UTC offset of UTC+9. This means lunch hour, business meetings, and deadlines occur at the same clock time in both zones. No time conversion is needed when coordinating between KST and JST.

How many hours apart is JST from KST?

KST and JST are in the same UTC offset (UTC+9), so there is no time difference between them. Events scheduled in one timezone occur at the same clock time in the other. This makes cross-timezone coordination between KST and JST regions effortless.

Is JST ahead or behind KST?

Neither — KST and JST share the same UTC offset (UTC+9) and always show the same time. Clocks in both timezones display identical hours and minutes at any given moment. There is no need to convert between these two timezones when scheduling across them.

Does KST observe daylight saving time?

No, Korea Standard Time does not observe daylight saving time. The UTC offset of UTC+9 remains the same year-round, making time conversions from KST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

Does JST observe daylight saving time?

No, Japan Standard Time does not observe daylight saving time. The UTC offset of UTC+9 remains the same year-round, making time conversions to JST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

What is the best time to call from KST to JST?

Since KST and JST share the same UTC offset, any time that works for you will also work for the other party. Standard business hours of 9:00 AM to 5:00 PM are ideal for professional calls. The conversion table above confirms that every hour aligns between these two timezones.

KST to JST Converter

Convert Korea Standard Time to Japan Standard Time. See the hour-by-hour conversion table below.

Timezone Details

Korea Standard Time

3:53 PM

Saturday, April 4, 2026

KST (UTC+09:00)

Japan Standard Time

3:53 PM

Saturday, April 4, 2026

JST (UTC+09:00)

Difference: +0 hours

KST DST: No

JST DST: No

24-Hour Overview

KST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

JST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

JST to KST EST to JST JST to EST PST to JST JST to PST GMT to JST JST to GMT IST to JST JST to IST

Cities in These Timezones

KST Cities

Seoul Busan

JST Cities

Tokyo Osaka Fukuoka

More Tools

Compare KST & JST Plan a Meeting (KST & JST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Korea Standard Time on Wikipedia Japan Standard Time on Wikipedia IANA Time Zone Database