Time in KST and IDLW
The time difference between Korea Standard Time (KST) and International Date Line West Time (IDLW) is 21 hours. International Date Line West Time is 21 hours behind Korea Standard Time.
This means 9am KST is 12pm IDLW (previous day) and 5pm KST is 8pm IDLW (previous day).
Korea Standard Time
- The current local time in KST is 12:47 pm (July 1, 2026)
- KST time zone offset is UTC+09:00
International Date Line West Time
- The current local time in IDLW is 3:47 pm (July 1, 2026)
- IDLW time zone offset is UTC-12:00
How to convert Korea Standard Time to International Date Line West Time?
Subtract 21 hours from Korea Standard Time to get International Date Line West Time.
Time in KST
00:00
Time in IDLW
00:00
Use the slider above to convert Korea 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
| KST | 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 |