What is the time difference between KST and UTC?

Coordinated Universal Time (UTC) is 9 hours behind Korea Standard Time (KST). KST uses a UTC offset of UTC+9, while UTC uses UTC. For example, when it's 9:00 AM in KST, it's 12:00 AM in UTC. 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 UTC?

To convert KST to UTC, subtract 9 hours from the KST time. For example, 9:00 AM KST is 12:00 AM UTC, and 5:00 PM KST is 8:00 AM UTC. Since neither timezone observes DST, this conversion stays the same all year. You can also use the interactive converter above for quick, accurate results.

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

When it's 12:00 PM (noon) in KST, it's 3:00 AM in UTC. This is because UTC is 9 hours behind KST. Similarly, when it's 6:00 PM in KST, it's 9:00 AM in UTC. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is UTC from KST?

UTC is 9 hours behind KST. This means when it's 9:00 AM in KST, it's 12:00 AM in UTC, and when it's midnight in KST, it's 3:00 PM in UTC. This offset is constant throughout the year since neither timezone uses daylight saving time. The conversion table above provides a complete hour-by-hour mapping.

Is UTC ahead or behind KST?

UTC is behind KST by 9 hours. Clocks in UTC show an earlier time than KST, meaning the day starts later in UTC relative to KST. For example, when it's noon in KST, it's still 3:00 AM in UTC. This difference stays the same year-round.

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 UTC observe daylight saving time?

No, Coordinated Universal Time does not observe daylight saving time. The UTC offset of UTC remains the same year-round, which simplifies time conversions. Regions using UTC keep their clocks unchanged regardless of the season.

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

The best time for a call between KST and UTC is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in UTC during their work day, call between 6:00 PM and 2:00 AM your KST time. Avoid calling too early or late, as the 9 hours difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do KST and UTC ever have the same time?

No, KST and UTC are always 9 hours apart and never display the same clock time simultaneously. Neither timezone observes DST, so the difference is constant year-round with no seasonal variation. The 9 hours offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

KST to UTC Converter

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

Timezone Details

Korea Standard Time

5:10 AM

Friday, April 3, 2026

KST (UTC+09:00)

UTC

8:10 PM

Thursday, April 2, 2026

UTC (UTC+00:00)

Difference: -9 hours

KST DST: No

24-Hour Overview

KST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

UTC — 24-hour overview

3p3p

6p6p

9p9p

10p

11p

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

UTC to KST

Cities in These Timezones

KST Cities

Seoul Busan

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Korea Standard Time on Wikipedia Coordinated Universal Time on Wikipedia IANA Time Zone Database