Time in JST and IDLW
The time difference between Japan Standard Time (JST) and International Date Line West Time (IDLW) is 21 hours. International Date Line West Time is 21 hours behind Japan Standard Time.
This means 9am JST is 12pm IDLW (previous day) and 5pm JST is 8pm IDLW (previous day).
Japan Standard Time
- The current local time in JST is 4:09 am (July 9, 2026)
- JST time zone offset is UTC+09:00
International Date Line West Time
- The current local time in IDLW is 7:09 am (July 9, 2026)
- IDLW time zone offset is UTC-12:00
How to convert Japan Standard Time to International Date Line West Time?
Subtract 21 hours from Japan Standard Time to get International Date Line West Time.
Time in JST
00:00
Time in IDLW
00:00
Use the slider above to convert Japan Standard Time to International Date Line West Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| JST | IDLW |
|---|---|
| 12am | 3am |
| 1am | 4am |
| 2am | 5am |
| 3am | 6am |
| 4am | 7am |
| 5am | 8am |
| 6am | 9am |
| 7am | 10am |
| 8am | 11am |
| 9am | 12pm |
| 10am | 1pm |
| 11am | 2pm |
| 12pm | 3pm |
| 1pm | 4pm |
| 2pm | 5pm |
| 3pm | 6pm |
| 4pm | 7pm |
| 5pm | 8pm |
| 6pm | 9pm |
| 7pm | 10pm |
| 8pm | 11pm |
| 9pm | 12am |
| 10pm | 1am |
| 11pm | 2am |