IST to MST Converter
MST is 12 hours 30 minutes behind IST. 9:00 AM IST = 8:30 PM MST (previous day).
MST is 12 hours 30 minutes behind IST at the moment. To convert IST to MST, subtract 12 hours 30 minutes from the IST time: 9:00 AM IST = 8:30 PM MST (previous day).
IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time). MST (Mountain Time) is used in Denver, Salt Lake City, Albuquerque, Calgary, Edmonton; Phoenix (Arizona) all year.
IST here means India Standard Time, not Irish or Israel Standard Time. Most of Arizona uses MST all year and does not switch to MDT.
IST to MST time conversion table
IST to MST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| IST | MST | Day |
|---|---|---|
| 12:00 AM IST | 11:30 AM MST | previous day |
| 1:00 AM IST | 12:30 PM MST | previous day |
| 2:00 AM IST | 1:30 PM MST | previous day |
| 3:00 AM IST | 2:30 PM MST | previous day |
| 4:00 AM IST | 3:30 PM MST | previous day |
| 5:00 AM IST | 4:30 PM MST | previous day |
| 6:00 AM IST | 5:30 PM MST | previous day |
| 7:00 AM IST | 6:30 PM MST | previous day |
| 8:00 AM IST | 7:30 PM MST | previous day |
| 9:00 AM IST | 8:30 PM MST | previous day |
| 10:00 AM IST | 9:30 PM MST | previous day |
| 11:00 AM IST | 10:30 PM MST | previous day |
| 12:00 PM IST | 11:30 PM MST | previous day |
| 1:00 PM IST | 12:30 AM MST | night |
| 2:00 PM IST | 1:30 AM MST | night |
| 3:00 PM IST | 2:30 AM MST | night |
| 4:00 PM IST | 3:30 AM MST | night |
| 5:00 PM IST | 4:30 AM MST | night |
| 6:00 PM IST | 5:30 AM MST | night |
| 7:00 PM IST | 6:30 AM MST | — |
| 8:00 PM IST | 7:30 AM MST | — |
| 9:00 PM IST | 8:30 AM MST | — |
| 10:00 PM IST | 9:30 AM MST | — |
| 11:00 PM IST | 10:30 AM MST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert IST to MST
Subtract 12 hours 30 minutes from the IST time to get MST.
Example: 9:00 AM IST = 8:30 PM MST (previous day).
Across midnight: 1:00 AM IST = 12:30 PM MST (previous day). The date changes, so always check the day as well as the hour.
Time difference between IST and MST
The time difference between IST and MST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 7 Mar 2026: MST is 12 hours 30 minutes behind of IST.
- 8 Mar 2026 – 31 Oct 2026: MST is 11 hours 30 minutes behind of IST.
- 1 Nov 2026 – 31 Dec 2026: MST is 12 hours 30 minutes behind of IST.
IST and MST during daylight saving time
- IST does not observe daylight saving time; it stays on UTC+5:30 all year.
- MST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from MST (UTC−7) to MDT (UTC−6).
Best time for a meeting between IST and MST
IST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IST, which is 6:30 PM MST.
IST to MST FAQ
What is the time difference between IST and MST?
Right now MST is 12 hours 30 minutes behind IST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM IST in MST?
9:00 AM IST is 8:30 PM MST (previous day).
What is 12 PM (noon) IST in MST?
12:00 PM IST is 11:30 PM MST (previous day).
Is MST ahead of or behind IST?
MST is 12 hours 30 minutes behind IST, so it is earlier in MST than in IST.
Does IST change for daylight saving time?
No. IST stays on the same offset all year, so conversions never shift for daylight saving time.
Does MST change for daylight saving time?
Yes. MST next changes on 14 Mar 2027, when clocks go forward one hour from MST to MDT.
What is the best time for a meeting between IST and MST?
IST and MST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IST, which is 6:30 PM MST.
Is MT the same as MST?
MST is the winter (standard) name of Mountain Time (MT). From March to November the same clocks are called MDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert MST to IST
Convert IST to other time zones
Convert other time zones to MST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.