Historically distinct IANA time zone
Asia/Tokyo
Local time now
JST · current offset
JapanGeographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 35.65° N, 139.74° E. Associated countries: JP.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Civil-time record
Recorded changes over time
From 1888 to 1951 · 9 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- +09:00 · JSTStandard time applies
- +10:00 · JDTDaylight saving time begins
- +09:00 · JSTStandard time applies
- +10:00 · JDTDaylight saving time begins
- +09:00 · JSTStandard time applies
- +10:00 · JDTDaylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1888-01-01 00:00 | +09:00 | JST | Standard time |
| 1948-05-02 01:00 | +10:00 | JDT | Daylight saving time |
| 1948-09-12 00:00 | +09:00 | JST | Standard time |
| 1949-04-03 01:00 | +10:00 | JDT | Daylight saving time |
| 1949-09-11 00:00 | +09:00 | JST | Standard time |
| 1950-05-07 01:00 | +10:00 | JDT | Daylight saving time |
| 1950-09-10 00:00 | +09:00 | JST | Standard time |
| 1951-05-06 01:00 | +10:00 | JDT | Daylight saving time |
| 1951-09-09 00:00 | +09:00 | JST | Standard time |