What is the time difference between UTC and JST?

Japan Standard Time (JST) is 9 hours ahead of Coordinated Universal Time (UTC). UTC uses a UTC offset of UTC, while JST uses UTC+9. For example, when it's 9:00 AM in UTC, it's 6:00 PM 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 UTC to JST?

To convert UTC to JST, add 9 hours to the UTC time. For example, 9:00 AM UTC is 6:00 PM JST, and 5:00 PM UTC is 2:00 AM JST. 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 JST when it's noon in UTC?

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

How many hours ahead is JST from UTC?

JST is 9 hours ahead of UTC. This means when it's 9:00 AM in UTC, it's 6:00 PM in JST, and when it's midnight in UTC, it's 9:00 AM in JST. 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 JST ahead or behind UTC?

JST is ahead of UTC by 9 hours. Clocks in JST show a later time than UTC, meaning the day starts earlier in JST relative to UTC. For example, when it's morning in UTC, it's already afternoon or evening in JST. This difference stays the same year-round.

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.

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 UTC to JST?

The best time for a call between UTC and JST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in JST during their work day, call between 12:00 AM and 8:00 AM your UTC time. Avoid calling too early or late, as the 9 hours difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do UTC and JST ever have the same time?

No, UTC and JST 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.

UTC to JST Converter

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

Timezone Details

UTC

12:58 AM

Tuesday, June 9, 2026

UTC (UTC+00:00)

Japan Standard Time

9:58 AM

Tuesday, June 9, 2026

JST (UTC+09:00)

Difference: +9 hours

JST DST: No

24-Hour Overview

UTC — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

JST — 24-hour overview

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

12a12a

3a3a

6a6a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

JST to UTC 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

JST Cities

Tokyo Osaka Fukuoka

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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