GMT to JST Converter & Meeting Planner
Quick answer: 9:00 AM GMT = 6:00 PM JST (fixed +00:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Greenwich Mean Time (GMT) and Japan Standard Time (JST)? You need to account for the standard time difference. Japan Standard Time is normally 9 hours ahead of Greenwich Mean Time. Whether you are coordinating between teams in London and Dublin and Tokyo and Osaka, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM GMT = 9:00 AM JST. The full 24-hour GMT to JST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM GMT = 12:00 AM JST (+1 day).
| GMT Time | JST Time |
|---|---|
| 12:00 AM (00:00) | 9:00 AM (09:00) |
| 1:00 AM (01:00) | 10:00 AM (10:00) |
| 2:00 AM (02:00) | 11:00 AM (11:00) |
| 3:00 AM (03:00) | 12:00 PM (12:00) |
| 4:00 AM (04:00) | 1:00 PM (13:00) |
| 5:00 AM (05:00) | 2:00 PM (14:00) |
| 6:00 AM (06:00) | 3:00 PM (15:00) |
| 7:00 AM (07:00) | 4:00 PM (16:00) |
| 8:00 AM (08:00) | 5:00 PM (17:00) |
| 9:00 AM (09:00) | 6:00 PM (18:00) |
| 10:00 AM (10:00) | 7:00 PM (19:00) |
| 11:00 AM (11:00) | 8:00 PM (20:00) |
| 12:00 PM (12:00) | 9:00 PM (21:00) |
| 1:00 PM (13:00) | 10:00 PM (22:00) |
| 2:00 PM (14:00) | 11:00 PM (23:00) |
| 3:00 PM (15:00) | 12:00 AM (00:00)+1 day |
| 4:00 PM (16:00) | 1:00 AM (01:00)+1 day |
| 5:00 PM (17:00) | 2:00 AM (02:00)+1 day |
| 6:00 PM (18:00) | 3:00 AM (03:00)+1 day |
| 7:00 PM (19:00) | 4:00 AM (04:00)+1 day |
| 8:00 PM (20:00) | 5:00 AM (05:00)+1 day |
| 9:00 PM (21:00) | 6:00 AM (06:00)+1 day |
| 10:00 PM (22:00) | 7:00 AM (07:00)+1 day |
| 11:00 PM (23:00) | 8:00 AM (08:00)+1 day |
Best time to call Tokyo from London
For most work calls, compare the normal business day in London (GMT) with the business day in Tokyo (JST). GMT commonly covers Europe, Africa, while JST is mainly associated with East Asia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 10:00 AM GMT, which corresponds to 5:00 PM - 6:00 PM JST. This window sits inside the typical GMT workday (9:00 AM - 5:00 PM) and the JST workday (9:00 AM - 6:00 PM).
- DST Safety: GMT or JST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- London Stock Exchange: 08:00-16:30 local time in London.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
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Frequently Asked Questions
What is the time difference between GMT and JST?
During standard time, Japan Standard Time is 9 hours ahead of Greenwich Mean Time.
What is the difference between GMT and BST?
GMT (Greenwich Mean Time) is the UK's standard winter offset at UTC+0, observed from the last Sunday in October through the last Sunday in March. BST (British Summer Time) is the daylight saving offset at UTC+1, applied each summer when clocks advance one hour.
Is GMT the same as UTC?
GMT and UTC share exactly the same numerical offset — both represent UTC+00:00 — but they are fundamentally different in nature. UTC is an atomic-clock-based international time standard used as the global reference, while GMT is a geographic time zone legally observed by specific countries including the United Kingdom and Ireland during winter months.
Does Japan observe Daylight Saving Time?
Japan has not observed Daylight Saving Time since 1951, when the practice introduced during the Allied occupation was abolished by the Japanese government. JST has remained fixed at UTC+9:00 ever since, and there is no current legislation to reintroduce DST in Japan.
Is JST the same as Korean Standard Time (KST)?
Yes, South Korea's Korean Standard Time (KST) operates at the same UTC+9:00 offset as JST, and South Korea also does not observe Daylight Saving Time. The two countries share an identical clock year-round, which simplifies scheduling for the significant trade, technology, and cultural exchange between Tokyo and Seoul.