GMT to JST Converter

Convert between any time zones worldwide. Free and accurate time zone converter with DST support.

Edit time and date on either side to see the conversion instantly.

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GMT
Greenwich Mean Time
Date changes are handled automatically when conversions cross midnight.
JST
Japan Standard Time
Date changes are handled automatically when conversions cross midnight.

Popular Timezone Conversions

CST to EST PST to EST MST to EST GMT to EST JST to EST GST to EST IST to EST EST to GMT

About GMT to JST Conversion

Converting time between GMT and JST requires understanding their time zone offsets and any daylight saving time adjustments. GMT (GMT) operates at UTC+0, while JST (JST) is set to UTC+9. This means JST is 9 hours ahead GMT. For example, when it's 3:16 AM GMT on February 4, 2026, it's 12:16 PM JST in JST. Europe/London observes daylight saving time, switching between GMT (UTC+0) and BST (UTC+1), while Asia/Tokyo does not observe daylight saving time. Use this converter to quickly find the equivalent time in JST for any time in GMT, whether you're scheduling meetings, planning travel, or coordinating with teams across different time zones.

How to Use the Time Zone Converter

  1. Select your source timezone from the "From timezone" dropdown (use search to find quickly)
  2. Enter the date and time you want to convert (or click "Today" and "Now" for current time)
  3. Select your target timezone from the "To timezone" dropdown
  4. The conversion updates automatically as you change inputs - no button needed!
  5. Use "Copy" button to copy the converted time, or use presets for quick conversions

More Conversions from GMT

GMT to EST GMT to CST GMT to MST GMT to MDT GMT to PST GMT to AKST GMT to HST GMT to CET GMT to EET GMT to MSK GMT to IST GMT to CST-CHINA GMT to HKT GMT to SGT GMT to GST GMT to AEST GMT to AWST GMT to NZST GMT to UTC GMT to ART GMT to BRT GMT to PHT GMT to BDT GMT to KST GMT to SAST GMT to ICT GMT to EAT GMT to WAT GMT to PKT

Frequently Asked Questions

What is the time difference between GMT and JST?

The time difference between GMT and JST is 9 hours. JST is 9 hours ahead GMT.

Is JST ahead of or behind GMT?

JST is ahead of GMT by 9 hours. When it's 12 PM in GMT, it's 9:00 PM in JST.

How many hours do you add to GMT to get JST?

You add 9 hours to GMT to get JST. For example, 12 PM GMT + 9 hours = 9:00 PM JST.

Does the GMT to JST time difference change during Daylight Saving Time?

Yes, the time difference can change during Daylight Saving Time (DST). GMT observes DST, which can affect the time difference during the transition periods in spring and fall.

What is 12 PM GMT in JST?

12 PM GMT is 9:00 PM JST. This conversion accounts for the 9-hour time difference between the two timezones.

Is GMT the same throughout the year when converting to JST?

No, the conversion between GMT and JST can vary during the year due to Daylight Saving Time. The time difference may change by 1 hour during DST transition periods (typically March and November), so always use a current timezone converter for accurate conversions.

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