GMT to JST Converter – Convert GMT to Japan Time

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Quick Reference: JST is 9 hours ahead of GMT. Japan does not observe daylight saving time.

Common GMT to JST Conversions:
00:00 GMT = 09:00 JST | 06:00 GMT = 15:00 JST | 09:00 GMT = 18:00 JST | 12:00 GMT = 21:00 JST | 15:00 GMT = 00:00 JST (next day) | 18:00 GMT = 03:00 JST (next day)

Related conversions: JST to GMT, UTC to JST, PST to JST, EST to JST, IST to JST

Quick Time Zone Conversions

GMT IST GMT PST GMT EST GMT UTC GMT CST EST PST UTC PST PST EST IST GMT CST IST

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Tuesday, July 8, 2025
12:00 PM
Your Local Time

Common Questions About GMT to JST Conversion

What is the time difference between GMT and JST?

JST is 9 hours ahead of GMT.

00:00 GMT 09:00 JST
09:00 GMT 18:00 JST
12:00 GMT 21:00 JST
20:00 GMT 05:00 JST +1

Is JST always 9 hours ahead?

Yes, both timezones maintain constant offsets year-round.

Neither GMT nor JST observe Daylight Saving Time, so the difference remains 9 hours.

What is the best time for meetings between GMT and JST?

Optimal window: 06:00-07:00 GMT = 15:00-16:00 JST

06:00 GMT
= 15:00 JST
08:00 GMT
= 17:00 JST

Works for UK/GMT early morning and Japan business hours.

GMT to JST Quick Conversion Chart

00:00 GMT 09:00 JST
09:00 GMT 18:00 JST
12:00 GMT 21:00 JST
14:00 GMT 23:00 JST
20:00 GMT 05:00 +1 JST
22:00 GMT 07:00 +1 JST

Frequently Asked Questions

To convert GMT to JST, use our free time zone converter above. Simply select your time and date to see the instant conversion. Our tool automatically accounts for Daylight Saving Time changes in both time zones.

The time difference between GMT and JST varies depending on whether Daylight Saving Time is in effect. Use our converter above for the most accurate, real-time time difference.

The best meeting time between United Kingdom (GMT) and Japan (JST) depends on business hours in both locations. Use our advanced meeting planner below to find overlapping work hours that suit both time zones.

United Kingdom observes Daylight Saving Time, switching between GMT and BST. This affects the time difference with JST during DST transitions.

Major cities in the GMT timezone include London and other cities in United Kingdom. These cities switch between GMT and BST for Daylight Saving Time.

Major cities in the JST timezone include Tokyo and other cities in Japan. This timezone does not observe Daylight Saving Time.

For calls between United Kingdom (GMT) and Japan (JST), use our converter to find mutually convenient times. Always specify both local times in meeting invites to avoid confusion, and account for Daylight Saving Time changes.

Need more help? Check our complete FAQ section.

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