GMT: Greenwich Mean Time
--:--:--
GMT to JST: convert Greenwich Mean Time to Japan Standard Time
JST is 9 hours ahead of GMT all year.
Neither clock changes for daylight saving, so the gap never moves.
One instant, two local clocks
Drag one day across both zones
Shared instant12:00 UTC
Difference nowJST is 9 hours ahead
GMTGreenwich Mean Time
12:00Thu, Jan 15
JSTJapan Standard Time
21:00Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time
Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.
Right now
JST: Japan Standard Time
--:--:--
Local times come from your browser's IANA time zone data.
GMT to JST hour by hour
| GMT | JST |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM (next day) |
| 4:00 PM | 1:00 AM (next day) |
| 5:00 PM | 2:00 AM (next day) |
| 6:00 PM | 3:00 AM (next day) |
| 7:00 PM | 4:00 AM (next day) |
| 8:00 PM | 5:00 AM (next day) |
| 9:00 PM | 6:00 AM (next day) |
| 10:00 PM | 7:00 AM (next day) |
| 11:00 PM | 8:00 AM (next day) |
Scheduling a call between GMT and JST
Standard business hours (9:00 AM to 5:00 PM) do not overlap: daytime in Greenwich Mean Time falls outside the working day in Japan Standard Time, so one side needs an early morning or late evening.
More GMT conversions
Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. GMT here means Greenwich Mean Time (fixed UTC+0 offset, all year); JST means Japan Standard Time (Japan).