IST to MST time conversion
MST is 12 hours 30 minutes behind IST.
MST is always UTC-7. Right now most places that use MST are on MDT (UTC-6): MDT is 11 hours 30 minutes behind IST.
Time difference with your location
IST is 5 hours 30 minutes ahead of UTC. Compare with your local time →
Choose a date and time
Choose the local time in IST to convert it to MST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · IST → MST
This table converts each hour in IST to MST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| IST | MST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 11:3011:30 AM -1 day | |
| 01:001:00 AM | 12:3012:30 PM -1 day | |
| 02:002:00 AM | 13:301:30 PM -1 day | |
| 03:003:00 AM | 14:302:30 PM -1 day | |
| 04:004:00 AM | 15:303:30 PM -1 day | |
| 05:005:00 AM | 16:304:30 PM -1 day | |
| 06:006:00 AM | 17:305:30 PM -1 day | |
| 07:007:00 AM | 18:306:30 PM -1 day | |
| 08:008:00 AM | 19:307:30 PM -1 day | |
| 09:009:00 AM | 20:308:30 PM -1 day | |
| 10:0010:00 AM | 21:309:30 PM -1 day | |
| 11:0011:00 AM | 22:3010:30 PM -1 day | |
| 12:0012:00 PM | 23:3011:30 PM -1 day | |
| 13:001:00 PM | 00:3012:30 AM | |
| 14:002:00 PM | 01:301:30 AM | |
| 15:003:00 PM | 02:302:30 AM | |
| 16:004:00 PM | 03:303:30 AM | |
| 17:005:00 PM | 04:304:30 AM | |
| 18:006:00 PM | 05:305:30 AM | |
| 19:007:00 PM | 06:306:30 AM | |
| 20:008:00 PM | 07:307:30 AM | |
| 21:009:00 PM | 08:308:30 AM | |
| 22:0010:00 PM | 09:309:30 AM | |
| 23:0011:00 PM | 10:3010:30 AM |
Quick conversion examples
These examples use IST (UTC+5:30) and MST (UTC-7); choosing a date applies the local clock changes.
Conversion formula: MST = IST − 12h30 · MDT = IST − 11h30.
| IST | MST |
|---|---|
| 6:00 AM IST | = 5:30 PM MST (-1 day) |
| 7:00 AM IST | = 6:30 PM MST (-1 day) |
| 8:00 AM IST | = 7:30 PM MST (-1 day) |
| 9:00 AM IST | = 8:30 PM MST (-1 day) |
| 10:00 AM IST | = 9:30 PM MST (-1 day) |
| 12:00 PM IST | = 11:30 PM MST (-1 day) |
| 3:00 PM IST | = 2:30 AM MST |
| 5:00 PM IST | = 4:30 AM MST |
| 6:00 PM IST | = 5:30 AM MST |
| 8:00 PM IST | = 7:30 AM MST |
Overlapping meeting hours
The 08:00–18:00 working days in IST and MST do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
IST and MST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | IST | MST |
|---|---|---|
| 2026 | No clock changes; UTC+5:30 all year. | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2027 | No clock changes; UTC+5:30 all year. | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2028 | No clock changes; UTC+5:30 all year. | · 02:00 → 03:00 · 02:00 → 01:00 |
At the start of 2026, MST is 12 hours 30 minutes behind IST. The difference changes during the following periods.
- From 2026-03-08 14:30 IST until 2026-11-01 13:30 IST, MDT is 11 hours 30 minutes behind IST.
- From 2027-03-14 14:30 IST until 2027-11-07 13:30 IST, MDT is 11 hours 30 minutes behind IST.
- From 2028-03-12 14:30 IST until 2028-11-05 13:30 IST, MDT is 11 hours 30 minutes behind IST.
Frequently asked questions
What time is 9 AM IST in MST?
9:00 AM IST = 8:30 PM MST (-1 day), using UTC+5:30 and UTC-7. Choose a date above for the seasonal local time.
Does the time difference between IST and MST change during the year?
Yes. During 2026–2028: MST is 12 hours 30 minutes behind IST; MST is 11 hours 30 minutes behind IST. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in MST?
Read the MST clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between IST and MST?
The 08:00–18:00 working days in IST and MST do not overlap.
What is the time difference between IST and MST now?
Right now, MST is 12 hours 30 minutes behind IST. Conversion formula: MST = IST − 12h30 · MDT = IST − 11h30.