IST to MST: India Standard Time to US Mountain Time
US Mountain Time is 11 hours 30 minutes behind IST in summer (MDT, UTC-06:00) and 12 hours 30 minutes behind IST in winter (MST, UTC-07:00). Use the converter above — type a time such as “9am IST to MST”, drag along the hour strips, or pick a date.
IST to MST conversion table
| India Standard Time (IST) | US Mountain Time — January | US Mountain Time — July |
|---|---|---|
| 12:00 AM IST | 11:30 AM MST (previous day) | 12:30 PM MDT (previous day) |
| 1:00 AM IST | 12:30 PM MST (previous day) | 1:30 PM MDT (previous day) |
| 2:00 AM IST | 1:30 PM MST (previous day) | 2:30 PM MDT (previous day) |
| 3:00 AM IST | 2:30 PM MST (previous day) | 3:30 PM MDT (previous day) |
| 4:00 AM IST | 3:30 PM MST (previous day) | 4:30 PM MDT (previous day) |
| 5:00 AM IST | 4:30 PM MST (previous day) | 5:30 PM MDT (previous day) |
| 6:00 AM IST | 5:30 PM MST (previous day) | 6:30 PM MDT (previous day) |
| 7:00 AM IST | 6:30 PM MST (previous day) | 7:30 PM MDT (previous day) |
| 8:00 AM IST | 7:30 PM MST (previous day) | 8:30 PM MDT (previous day) |
| 9:00 AM IST | 8:30 PM MST (previous day) | 9:30 PM MDT (previous day) |
| 10:00 AM IST | 9:30 PM MST (previous day) | 10:30 PM MDT (previous day) |
| 11:00 AM IST | 10:30 PM MST (previous day) | 11:30 PM MDT (previous day) |
| 12:00 PM IST | 11:30 PM MST (previous day) | 12:30 AM MDT |
| 1:00 PM IST | 12:30 AM MST | 1:30 AM MDT |
| 2:00 PM IST | 1:30 AM MST | 2:30 AM MDT |
| 3:00 PM IST | 2:30 AM MST | 3:30 AM MDT |
| 4:00 PM IST | 3:30 AM MST | 4:30 AM MDT |
| 5:00 PM IST | 4:30 AM MST | 5:30 AM MDT |
| 6:00 PM IST | 5:30 AM MST | 6:30 AM MDT |
| 7:00 PM IST | 6:30 AM MST | 7:30 AM MDT |
| 8:00 PM IST | 7:30 AM MST | 8:30 AM MDT |
| 9:00 PM IST | 8:30 AM MST | 9:30 AM MDT |
| 10:00 PM IST | 9:30 AM MST | 10:30 AM MDT |
| 11:00 PM IST | 10:30 AM MST | 11:30 AM MDT |
Daylight saving
India Standard Time has no daylight saving — it stays at UTC+05:30 all year. US Mountain Time switches to MDT around March and back to MST around November. Because of this the difference between IST and MST changes during the year — the converter above always uses the right one for the date you pick.
Frequently asked questions
- What is the time difference between IST and MST?
- US Mountain Time is 11h 30m behind IST in summer (MDT) and 12h 30m behind in winter (MST).
- What is 9 AM IST in MST?
- 9:00 AM IST is 9:30 PM MDT (previous day) in summer and 8:30 PM MST (previous day) in winter.
- Which IST is this?
- Here IST means India Standard Time, used in India (Mumbai, Delhi, Bengaluru). Abbreviations can mean different places — IST is also used for Irish and Israel Standard Time; type a city in the converter if you meant another one.
- Is MST the same as MDT?
- They are the same place in different seasons: MST/MDT — MST in winter and MDT during daylight saving. GlobalHours switches automatically on the right date.