IST to MST Time Converter
Type a time in IST to see it in MST, with daylight saving handled for the date you pick. Every hour of the day is in the table below, and the meeting planner shows when both working days overlap.
In Denver
8:30 pmMST
9:00 am IST on Wed 14 Jan 2026 is 8:30 pm MST the day before. Denver is 12 h 30 min behind India.
- Date there
- Tuesday 13 January 2026
- Offsets
- IST UTC+5:30 · MST UTC−7
- Date used
- Example day: Wednesday 14 January 2026
How this works: Method, 3 sources,
How this works
Method
Here IST means India Standard Time, UTC+5:30 all year; MST means Mountain Time, MST (UTC−7) in its winter and MDT (UTC−6) in its summer, as kept in Denver. So MST is 12 h 30 min behind IST, and MDT is 11 h 30 min behind. Two 9-to-5 working days do not overlap at all, so one side has to start early or stay late. Full method
Sources
Changes
- 15 more conversion pages (IST to CST, BST to IST, SGT, GST, JST, MST and more); each conversion page shows all 24 hours with working hours shaded, and its best meeting times.
- The pickers find about a thousand more cities, states and countries (Seattle, Bangalore, Texas), and each conversion page names the next clock change on either side.
- The converter opens on the time now, live, with a Now choice beside the time, and the main converter starts from your own time zone.
- First published, with a world clock, pages for the time in 31 places and 15 common conversions such as PST to IST.
How to convert IST to MST
Here IST means India Standard Time, UTC+5:30 all year; MST means Mountain Time, MST (UTC−7) in its winter and MDT (UTC−6) in its summer, as kept in Denver. So MST is 12 h 30 min behind IST, and MDT is 11 h 30 min behind. Two 9-to-5 working days do not overlap at all, so one side has to start early or stay late.
From India, Mountain Time matters to people working with firms in Denver, Boulder and Salt Lake City, to students at universities in Colorado, Utah and Arizona, and to families in Phoenix. It is one of the widest gaps to the US mainland: a Denver working day of 9:00 am to 5:00 pm runs from 9:30 pm to 5:30 am in India in winter, so live calls usually sit late in the Indian evening or early in the Indian morning.
Check which part of Mountain Time the other person is in. Denver changes to MDT in March and back to MST in November, which moves a fixed Denver meeting an hour on your Indian calendar. Phoenix never changes, so a Phoenix meeting stays at the same Indian time all year, and in summer Phoenix is an hour behind Denver. When a US form or webinar says only “MT”, it usually means whatever Denver’s clock shows on the day.
Rule of thumb: Subtract 12½ hours from Indian time (11½ while Denver is on MDT): 9:00 pm IST is 8:30 am MST or 9:30 am MDT the same day.
MST = IST −12:30 · MDT = IST −11:30
- In the tz database, America/Phoenix last used daylight saving time in 1967 and has kept MST all year since March 1968. Source: IANA tz database, file northamerica (United States rules).
Meeting planner: best times for IST and MST
The IST and MST working days never overlap, so every meeting asks one side to start early or stay late. The shaded runs are the hours when both clocks are between 7 am and 9 pm; pick the end that suits whoever has the more flexible day, and swap it now and then.
January: IST and MST
- No hour is inside 9 to 5 on both clocks.
- Early or late for one side: 7:00 am to 9:30 am IST is 6:30 pm to 9:00 pm MST the day before (2 h 30 min); 7:30 pm to 9:00 pm IST is 7:00 am to 8:30 am MST (1 h 30 min).
July: IST and MDT
- No hour is inside 9 to 5 on both clocks.
- Early or late for one side: 7:00 am to 8:30 am IST is 7:30 pm to 9:00 pm MDT the day before (1 h 30 min); 6:30 pm to 9:00 pm IST is 7:00 am to 9:30 am MDT (2 h 30 min).
Both between 9 am and 5 pmBoth between 7 am and 9 pm
IST to MST time conversion table
Every hour of the IST day and the time in MST: the January column holds while the clocks are on IST and MST, the July column while they are on IST and MDT. The dates they switch are under the table.
| IST time | MST in January | MDT in July |
|---|---|---|
| 12:00 am | 11:30 am (day before) | 12:30 pm (day before) |
| 1:00 am | 12:30 pm (day before) | 1:30 pm (day before) |
| 2:00 am | 1:30 pm (day before) | 2:30 pm (day before) |
| 3:00 am | 2:30 pm (day before) | 3:30 pm (day before) |
| 4:00 am | 3:30 pm (day before) | 4:30 pm (day before) |
| 5:00 am | 4:30 pm (day before) | 5:30 pm (day before) |
| 6:00 am | 5:30 pm (day before) | 6:30 pm (day before) |
| 7:00 am | 6:30 pm (day before) | 7:30 pm (day before) |
| 8:00 am | 7:30 pm (day before) | 8:30 pm (day before) |
| 9:00 am | 8:30 pm (day before) | 9:30 pm (day before) |
| 10:00 am | 9:30 pm (day before) | 10:30 pm (day before) |
| 11:00 am | 10:30 pm (day before) | 11:30 pm (day before) |
| 12:00 pm | 11:30 pm (day before) | 12:30 am |
| 1:00 pm | 12:30 am | 1:30 am |
| 2:00 pm | 1:30 am | 2:30 am |
| 3:00 pm | 2:30 am | 3:30 am |
| 4:00 pm | 3:30 am | 4:30 am |
| 5:00 pm | 4:30 am | 5:30 am |
| 6:00 pm | 5:30 am | 6:30 am |
| 7:00 pm | 6:30 am | 7:30 am |
| 8:00 pm | 7:30 am | 8:30 am |
| 9:00 pm | 8:30 am | 9:30 am |
| 10:00 pm | 9:30 am | 10:30 am |
| 11:00 pm | 10:30 am | 11:30 am |
Shaded: 9 am to 5 pm on that clock. Where a row is shaded on both sides, both are at work.
When the IST–MST difference changes next
| Date | What happens | Then |
|---|---|---|
| Sun 1 Nov 2026 | Denver falls back (MST) | MST is 12 h 30 min behind IST |
| Sun 14 Mar 2027 | Denver springs forward (MDT) | MDT is 11 h 30 min behind IST |
Frequently Asked Questions
What is 9 am IST in MST?
In January, 9:00 am IST is 8:30 pm MST the day before. In July, 9:00 am IST is 9:30 pm MDT the day before.
What is 1 pm IST in MST?
1:00 pm in India is 12:30 am MST the same day, in the middle of the night in Denver. While Denver is on MDT it is 1:30 am. In Arizona it is 12:30 am all year.
When can I call Denver from India?
Between about 7:30 and 9:00 pm IST you reach Denver between 7:00 and 8:30 am in winter; in summer the same Indian hours are 8:00 to 9:30 am in Denver. Early Indian mornings, around 7:00 to 9:30 am, catch the Denver evening of the day before.