Greenwich Mean Time to Japan Standard Time
Convert times between Greenwich Mean Time (GMT, UTC+0:00) and Japan Standard Time (JST, UTC+9:00). Japan Standard Time is 9 hours ahead of Greenwich Mean Time in standard time. During daylight saving time this difference changes to 8 hours.
UTC+0:00 / +1:00→UTC+9:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Greenwich Mean Time | GMT / BST | UTC+0:00 | UTC+1:00 | United Kingdom |
| Japan Standard Time | JST | UTC+9:00 | — | Japan |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (GMT → JST)
| Greenwich Mean Time | Japan Standard Time |
|---|---|
| 12:00 AM GMT | 9:00 AM JST |
| 6:00 AM GMT | 3:00 PM JST |
| 9:00 AM GMT | 6:00 PM JST |
| 12:00 PM GMT | 9:00 PM JST |
| 3:00 PM GMT | 12:00 AM (next day) JST |
| 6:00 PM GMT | 3:00 AM (next day) JST |
| 9:00 PM GMT | 6:00 AM (next day) JST |
Summer (DST) Conversion (BST → JST)
| Greenwich Mean Time (summer) | Japan Standard Time (summer) |
|---|---|
| 12:00 AM BST | 8:00 AM JST |
| 6:00 AM BST | 2:00 PM JST |
| 9:00 AM BST | 5:00 PM JST |
| 12:00 PM BST | 8:00 PM JST |
| 3:00 PM BST | 11:00 PM JST |
| 6:00 PM BST | 2:00 AM (next day) JST |
| 9:00 PM BST | 5:00 AM (next day) JST |
Daylight Saving Time (DST) Notes
- Greenwich Mean Time observes DST. Clocks advance 1 hour to BST (UTC+1:00) roughly from month 3 to 10.
- The offset difference shifts between 9h (standard) and 8h (DST season). Always verify the current offset using the live converter below.
Frequently Asked Questions
How do I convert GMT to JST?
Add 9 hours to the GMT time to get JST. For example, 9:00 AM GMT = 6:00 PM JST.
What is the current UTC offset for Greenwich Mean Time?
Greenwich Mean Time is UTC+0:00 during standard time (GMT) and UTC+1:00 during summer daylight saving time (BST).
Is Japan Standard Time ahead or behind Greenwich Mean Time?
Japan Standard Time is 9 hours ahead of Greenwich Mean Time in standard time.
When is a good time to schedule a meeting between GMT and JST?
Due to the 9-hour difference, business-hours overlap may be limited. Use the live timezone converter to find a mutually convenient time.
Related Timezone Conversions
Greenwich Mean Time → Central European TimeGMT / CETGreenwich Mean Time → Eastern European TimeGMT / EETGreenwich Mean Time → Moscow TimeGMT / MSKGreenwich Mean Time → Turkey TimeGMT / TRTGreenwich Mean Time → China Standard TimeGMT / CSTGreenwich Mean Time → Hong Kong TimeGMT / HKTGreenwich Mean Time → Korea Standard TimeGMT / KSTGreenwich Mean Time → US Eastern TimeGMT / EST
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.