What is WIB in MST?
Mountain Time is 13 hours behind
Western Indonesian Time is on UTC+7:00 and Mountain Time is on UTC−6:00 right now. Mountain Time is on daylight saving, so its clocks read MDT. The gap changes during the year — see below.
- Time in Jakarta
- 9:56 am
- Time in Denver
- 8:56 pm
- Difference
- −13 h
- Next clock change
- November 1, 2026
Convert a time
MDT — Mountain Time
8:00 pm
Tue, the previous day
When the difference changes
Western Indonesian Time and Mountain Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – November 1, 2026Mountain Time is 13 hours behind
- November 1, 2026 – March 14, 2027Mountain Time is 14 hours behind
- March 14, 2027 – onwardsMountain Time is 13 hours behind
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Western Indonesian Time
Western Indonesian Time stays on WIB all year, so its offset from UTC never moves.
Mountain Time
Clocks go back one hour at 2am local time, becoming MST.
WIB to MST conversion table
Every hour of Wednesday, September 23, 2026, converted from Western Indonesian Time to Mountain Time. 13 of the 24 hours fall on a different calendar day in Denver, which is marked.
- 12:00 am WIB
- 11:00 am MDT−1 day
- 1:00 am WIB
- 12:00 pm MDT−1 day
- 2:00 am WIB
- 1:00 pm MDT−1 day
- 3:00 am WIB
- 2:00 pm MDT−1 day
- 4:00 am WIB
- 3:00 pm MDT−1 day
- 5:00 am WIB
- 4:00 pm MDT−1 day
- 6:00 am WIB
- 5:00 pm MDT−1 day
- 7:00 am WIB
- 6:00 pm MDT−1 day
- 8:00 am WIB
- 7:00 pm MDT−1 day
- 9:00 am WIB
- 8:00 pm MDT−1 day
- 10:00 am WIB
- 9:00 pm MDT−1 day
- 11:00 am WIB
- 10:00 pm MDT−1 day
- 12:00 pm WIB
- 11:00 pm MDT−1 day
- 1:00 pm WIB
- 12:00 am MDT
- 2:00 pm WIB
- 1:00 am MDT
- 3:00 pm WIB
- 2:00 am MDT
- 4:00 pm WIB
- 3:00 am MDT
- 5:00 pm WIB
- 4:00 am MDT
- 6:00 pm WIB
- 5:00 am MDT
- 7:00 pm WIB
- 6:00 am MDT
- 8:00 pm WIB
- 7:00 am MDT
- 9:00 pm WIB
- 8:00 am MDT
- 10:00 pm WIB
- 9:00 am MDT
- 11:00 pm WIB
- 10:00 am MDT
Scheduling between the two
There is no overlap between a nine-to-six working day in Jakarta and one in Denver — the gap is too wide. A call has to sit early or late for one side. Early morning in Jakarta is the usual compromise, since that is late afternoon or evening in Denver.
Mountain Time (MDT) is used in Salt Lake City, Albuquerque and Calgary. Arizona keeps MST all year and does not follow MDT.