Time in IDLW and ULAST
The time difference between International Date Line West Time (IDLW) and Ulaanbaatar Summer Time (ULAST) is 21 hours. Ulaanbaatar Summer Time is 21 hours ahead of International Date Line West Time.
This means 9am IDLW is 6am ULAST (next day) and 5pm IDLW is 2pm ULAST (next day).
International Date Line West Time
- The current local time in IDLW is 12:37 am (July 19, 2026)
- IDLW time zone offset is UTC-12:00
Ulaanbaatar Summer Time
- The current local time in ULAST is 9:37 pm (July 18, 2026)
- ULAST time zone offset is UTC+09:00
How to convert International Date Line West Time to Ulaanbaatar Summer Time?
Add 21 hours to International Date Line West Time to get Ulaanbaatar Summer Time.
Time in IDLW
00:00
Time in ULAST
00:00
Use the slider above to convert International Date Line West Time to Ulaanbaatar Summer 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
| IDLW | ULAST |
|---|---|
| 12am | 9pm |
| 1am | 10pm |
| 2am | 11pm |
| 3am | 12am |
| 4am | 1am |
| 5am | 2am |
| 6am | 3am |
| 7am | 4am |
| 8am | 5am |
| 9am | 6am |
| 10am | 7am |
| 11am | 8am |
| 12pm | 9am |
| 1pm | 10am |
| 2pm | 11am |
| 3pm | 12pm |
| 4pm | 1pm |
| 5pm | 2pm |
| 6pm | 3pm |
| 7pm | 4pm |
| 8pm | 5pm |
| 9pm | 6pm |
| 10pm | 7pm |
| 11pm | 8pm |