What is the time difference between JST and SGT?

Singapore Time (SGT) is 1 hour behind Japan Standard Time (JST). JST uses a UTC offset of UTC+9, while SGT uses UTC+8. For example, when it's 9:00 AM in JST, it's 8:00 AM in SGT. 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 JST to SGT?

To convert JST to SGT, subtract 1 hour from the JST time. For example, 9:00 AM JST is 8:00 AM SGT, and 5:00 PM JST is 4:00 PM SGT. 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 SGT when it's noon in JST?

When it's 12:00 PM (noon) in JST, it's 11:00 AM in SGT. This is because SGT is 1 hour behind JST. Similarly, when it's 6:00 PM in JST, it's 5:00 PM in SGT. 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 SGT from JST?

SGT is 1 hour behind JST. This means when it's 9:00 AM in JST, it's 8:00 AM in SGT, and when it's midnight in JST, it's 11:00 PM in SGT. 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 SGT ahead or behind JST?

SGT is behind JST by 1 hour. Clocks in SGT show an earlier time than JST, meaning the day starts later in SGT relative to JST. For example, when it's noon in JST, it's still 11:00 AM in SGT. This difference stays the same year-round.

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 from JST more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

Does SGT observe daylight saving time?

No, Singapore Time does not observe daylight saving time. The UTC offset of UTC+8 remains the same year-round, making time conversions to SGT more predictable. Countries and regions in this timezone keep their clocks unchanged regardless of the season.

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

The best time for a call between JST and SGT is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in SGT during their work day, call between 10:00 AM and 6:00 PM your JST time. Avoid calling too early or late, as the 1 hour 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 JST and SGT ever have the same time?

No, JST and SGT are always 1 hour 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 1 hour 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.

JST to SGT Converter

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

Timezone Details

Japan Standard Time

8:40 PM

Friday, April 3, 2026

JST (UTC+09:00)

Singapore Time

7:40 PM

Friday, April 3, 2026

SGT (UTC+08:00)

Difference: -1 hour

JST DST: No

SGT DST: No

24-Hour Overview

JST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

SGT — 24-hour overview

11p11p

12a

2a2a

5a5a

8a8a

10a

11a11a

12p

2p2p

5p5p

8p8p

10p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

SGT to JST 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

SGT Cities

Singapore

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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