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Convert Japan Standard Time (JST) to Greenwich Mean Time (GMT, UTC+0) with our professional time zone converter. Designed for international business meetings between Tokyo to London, this tool provides real-time conversion, optimal meeting time suggestions, business hours comparison, and 24-hour conversion tables. Features include live clock displays, meeting scheduler, time zone maps, and daylight saving time handling. Perfect for international business coordination, global team management, and cross-border communication. No registration required - works instantly on all devices with offline capability.
Greenwich Mean Time is 9 hours behind Japan Standard Time
Complete hourly conversion for Japan Standard Time to Greenwich Mean Time
| Japan Standard Time | Greenwich Mean Time | 24-Hour JST | 24-Hour GMT |
|---|---|---|---|
| 12:00 AM | 3:00 PM (previous day) | 00:00 | 15:00 |
| 1:00 AM | 4:00 PM (previous day) | 01:00 | 16:00 |
| 2:00 AM | 5:00 PM (previous day) | 02:00 | 17:00 |
| 3:00 AM | 6:00 PM (previous day) | 03:00 | 18:00 |
| 4:00 AM | 7:00 PM (previous day) | 04:00 | 19:00 |
| 5:00 AM | 8:00 PM (previous day) | 05:00 | 20:00 |
| 6:00 AM | 9:00 PM (previous day) | 06:00 | 21:00 |
| 7:00 AM | 10:00 PM (previous day) | 07:00 | 22:00 |
| 8:00 AM | 11:00 PM (previous day) | 08:00 | 23:00 |
| 9:00 AM | 12:00 AM | 09:00 | 00:00 |
| 10:00 AM | 1:00 AM | 10:00 | 01:00 |
| 11:00 AM | 2:00 AM | 11:00 | 02:00 |
| 12:00 PM | 3:00 AM | 12:00 | 03:00 |
| 1:00 PM | 4:00 AM | 13:00 | 04:00 |
| 2:00 PM | 5:00 AM | 14:00 | 05:00 |
| 3:00 PM | 6:00 AM | 15:00 | 06:00 |
| 4:00 PM | 7:00 AM | 16:00 | 07:00 |
| 5:00 PM | 8:00 AM | 17:00 | 08:00 |
| 6:00 PM | 9:00 AM | 18:00 | 09:00 |
| 7:00 PM | 10:00 AM | 19:00 | 10:00 |
| 8:00 PM | 11:00 AM | 20:00 | 11:00 |
| 9:00 PM | 12:00 PM | 21:00 | 12:00 |
| 10:00 PM | 1:00 PM | 22:00 | 13:00 |
| 11:00 PM | 2:00 PM | 23:00 | 14:00 |
Optimal hours for calls between JST and GMT
Based on standard business hours (9:00 AM - 6:00 PM) in each time zone
Technical information for both time zones
Source timezone
Target timezone
Japan Standard Time (JST) is 9 hours ahead of Greenwich Mean Time (GMT). This means that when it is noon in GMT, it is 9:00 PM in JST.
To convert JST to GMT manually, subtract 9 hours from the JST time. For example, if it is 3:00 PM JST, it would be 6:00 AM GMT after the conversion.
Yes, several online tools can help you convert JST to GMT easily. Websites like iformat.io provide user-friendly interfaces where you can instantly input your JST time and receive the corresponding GMT.
The most convenient time for a conference call between JST and GMT is between 5:00 PM and 7:00 PM in JST, corresponding to 8:00 AM and 10:00 AM in GMT. This timeframe accommodates regular working hours for both regions.
Japan does not observe daylight saving time, so the conversion from JST to GMT remains consistent throughout the year. You will always subtract 9 hours from JST to get GMT.
Yes, iformat.io offers tools for easy time zone conversions, including options specifically for converting between JST and GMT. These tools streamline the process and help avoid confusion when scheduling across different time zones.
