Japan Standard Time to Greenwich Mean Time
Convert times between Japan Standard Time (JST, UTC+9:00) and Greenwich Mean Time (GMT, UTC+0:00). Greenwich Mean Time is 9 hours behind Japan Standard Time in standard time. During daylight saving time this difference changes to 8 hours.
UTC+9:00→UTC+0:00 / +1:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Japan Standard Time | JST | UTC+9:00 | — | Japan |
| Greenwich Mean Time | GMT / BST | UTC+0:00 | UTC+1:00 | United Kingdom |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (JST → GMT)
| Japan Standard Time | Greenwich Mean Time |
|---|---|
| 12:00 AM JST | 3:00 PM (prev day) GMT |
| 6:00 AM JST | 9:00 PM (prev day) GMT |
| 9:00 AM JST | 12:00 AM GMT |
| 12:00 PM JST | 3:00 AM GMT |
| 3:00 PM JST | 6:00 AM GMT |
| 6:00 PM JST | 9:00 AM GMT |
| 9:00 PM JST | 12:00 PM GMT |
Summer (DST) Conversion (JST → BST)
| Japan Standard Time (summer) | Greenwich Mean Time (summer) |
|---|---|
| 12:00 AM JST | 4:00 PM (prev day) BST |
| 6:00 AM JST | 10:00 PM (prev day) BST |
| 9:00 AM JST | 1:00 AM BST |
| 12:00 PM JST | 4:00 AM BST |
| 3:00 PM JST | 7:00 AM BST |
| 6:00 PM JST | 10:00 AM BST |
| 9:00 PM JST | 1:00 PM BST |
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 JST to GMT?
Add (-9) hours to the JST time to get GMT. For example, 9:00 AM JST = 12:00 AM GMT.
What is the current UTC offset for Japan Standard Time?
Japan Standard Time is always UTC+9:00 (JST) — it does not observe DST.
Is Greenwich Mean Time ahead or behind Japan Standard Time?
Greenwich Mean Time is 9 hours behind Japan Standard Time in standard time.
When is a good time to schedule a meeting between JST and GMT?
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
Japan Standard Time → Central European TimeJST / CETJapan Standard Time → Eastern European TimeJST / EETJapan Standard Time → Moscow TimeJST / MSKJapan Standard Time → Turkey TimeJST / TRTJapan Standard Time → China Standard TimeJST / CSTJapan Standard Time → Hong Kong TimeJST / HKTJapan Standard Time → Korea Standard TimeJST / KSTJapan Standard Time → US Eastern TimeJST / EST
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.