Time in MST and IDLW
The time difference between Mountain Standard Time (MST) and International Date Line West Time (IDLW) is 5 hours. International Date Line West Time is 5 hours behind Mountain Standard Time.
This means 9am MST is 4am IDLW and 5pm MST is 12pm IDLW.
Mountain Standard Time
- The current local time in MST is 3:25 am (July 3, 2026)
- MST time zone offset is UTC-07:00
International Date Line West Time
- The current local time in IDLW is 8:25 am (July 3, 2026)
- IDLW time zone offset is UTC-12:00
How to convert Mountain Standard Time to International Date Line West Time?
Subtract 5 hours from Mountain Standard Time to get International Date Line West Time.
Time in MST
00:00
Time in IDLW
00:00
Use the slider above to convert Mountain 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
| MST | IDLW |
|---|---|
| 12am | 7pm |
| 1am | 8pm |
| 2am | 9pm |
| 3am | 10pm |
| 4am | 11pm |
| 5am | 12am |
| 6am | 1am |
| 7am | 2am |
| 8am | 3am |
| 9am | 4am |
| 10am | 5am |
| 11am | 6am |
| 12pm | 7am |
| 1pm | 8am |
| 2pm | 9am |
| 3pm | 10am |
| 4pm | 11am |
| 5pm | 12pm |
| 6pm | 1pm |
| 7pm | 2pm |
| 8pm | 3pm |
| 9pm | 4pm |
| 10pm | 5pm |
| 11pm | 6pm |