Convert India Standard Time (IST) to Mountain Time (MST/MDT), with daylight saving applied for the exact date you pick.
Tue, Oct 27
Mon, Oct 26 Previous day
| Su | Mo | Tu | We | Th | Fr | Sa |
|---|
IST 9 to 5 MDT 9 to 5
MDT is 11 hours 30 minutes behind IST.
The same conversion works for every city on these clocks, such as India to Denver, India to Arizona and Delhi to Denver.
Shaded areas follow the official zone boundaries, so a country split across zones is split here too. Hover or tap a region for its local time.
Every hour of Tuesday, October 27, 2026, side by side. Days with a clock change show 23 or 25 rows.
Shaded rows fall inside working hours in both places.
| New Delhi (IST) | Denver (MDT) | Working hours |
|---|---|---|
| 12:00 AM | 12:30 PM previous day | |
| 1:00 AM | 1:30 PM previous day | |
| 2:00 AM | 2:30 PM previous day | |
| 3:00 AM | 3:30 PM previous day | |
| 4:00 AM | 4:30 PM previous day | |
| 5:00 AM | 5:30 PM previous day | |
| 6:00 AM | 6:30 PM previous day | |
| 7:00 AM | 7:30 PM previous day | |
| 8:00 AM | 8:30 PM previous day | |
| 9:00 AM | 9:30 PM previous day | |
| 10:00 AM | 10:30 PM previous day | |
| 11:00 AM | 11:30 PM previous day | |
| 12:00 PM | 12:30 AM | |
| 1:00 PM | 1:30 AM | |
| 2:00 PM | 2:30 AM | |
| 3:00 PM | 3:30 AM | |
| 4:00 PM | 4:30 AM | |
| 5:00 PM | 5:30 AM | |
| 6:00 PM | 6:30 AM | |
| 7:00 PM | 7:30 AM | |
| 8:00 PM | 8:30 AM | |
| 9:00 PM | 9:30 AM | |
| 10:00 PM | 10:30 AM | |
| 11:00 PM | 11:30 AM |
Every hour of the India Standard Time day, plus the common half hours, and their MST equivalents. The second column covers the part of the year when the clocks are on a different gap.
| India Standard Time | MDT 11 h 30 min behind, most of the year (238 days in 2026) | MST 12 h 30 min behind, about 18 weeks in 2026 |
|---|---|---|
| 12:00 AM | 12:30 PM (previous day) | 11:30 AM (previous day) |
| 1:00 AM | 1:30 PM (previous day) | 12:30 PM (previous day) |
| 2:00 AM | 2:30 PM (previous day) | 1:30 PM (previous day) |
| 3:00 AM | 3:30 PM (previous day) | 2:30 PM (previous day) |
| 4:00 AM | 4:30 PM (previous day) | 3:30 PM (previous day) |
| 5:00 AM | 5:30 PM (previous day) | 4:30 PM (previous day) |
| 6:00 AM | 6:30 PM (previous day) | 5:30 PM (previous day) |
| 7:00 AM | 7:30 PM (previous day) | 6:30 PM (previous day) |
| 8:00 AM | 8:30 PM (previous day) | 7:30 PM (previous day) |
| 9:00 AM | 9:30 PM (previous day) | 8:30 PM (previous day) |
| 9:30 AM | 10:00 PM (previous day) | 9:00 PM (previous day) |
| 10:00 AM | 10:30 PM (previous day) | 9:30 PM (previous day) |
| 10:30 AM | 11:00 PM (previous day) | 10:00 PM (previous day) |
| 11:00 AM | 11:30 PM (previous day) | 10:30 PM (previous day) |
| 11:30 AM | 12:00 AM | 11:00 PM (previous day) |
| 12:00 PM | 12:30 AM | 11:30 PM (previous day) |
| 12:30 PM | 1:00 AM | 12:00 AM |
| 1:00 PM | 1:30 AM | 12:30 AM |
| 1:30 PM | 2:00 AM | 1:00 AM |
| 2:00 PM | 2:30 AM | 1:30 AM |
| 2:30 PM | 3:00 AM | 2:00 AM |
| 3:00 PM | 3:30 AM | 2:30 AM |
| 3:30 PM | 4:00 AM | 3:00 AM |
| 4:00 PM | 4:30 AM | 3:30 AM |
| 4:30 PM | 5:00 AM | 4:00 AM |
| 5:00 PM | 5:30 AM | 4:30 AM |
| 5:30 PM | 6:00 AM | 5:00 AM |
| 6:00 PM | 6:30 AM | 5:30 AM |
| 7:00 PM | 7:30 AM | 6:30 AM |
| 8:00 PM | 8:30 AM | 7:30 AM |
| 9:00 PM | 9:30 AM | 8:30 AM |
| 10:00 PM | 10:30 AM | 9:30 AM |
| 11:00 PM | 11:30 AM | 10:30 AM |
Each row is a stretch of days with one constant difference, split at every clock change.
| Dates | IST | MST | Difference |
|---|---|---|---|
| Thu, Jan 1, 2026 until Sun, Mar 8, 2026 | IST | MST | MST 12 h 30 min behind |
| Sun, Mar 8, 2026 until Sun, Nov 1, 2026 | IST | MDT | MDT 11 h 30 min behind |
| Sun, Nov 1, 2026 until Sun, Mar 14, 2027 | IST | MST | MST 12 h 30 min behind |
| Sun, Mar 14, 2027 until Sun, Nov 7, 2027 | IST | MDT | MDT 11 h 30 min behind |
| Sun, Nov 7, 2027 until Sat, Jan 1, 2028 | IST | MST | MST 12 h 30 min behind |
India Standard Time is UTC+5:30 all year. The whole country keeps a single clock, and India has not observed daylight saving time since the 1940s, so IST never changes.
IST can also stand for Irish Standard Time or Israel Standard Time. On this site IST always means India Standard Time (Asia/Kolkata).
Mountain Time follows the clock in Denver: Mountain Standard Time (MST, UTC−7) in winter and Mountain Daylight Time (MDT, UTC−6) during US daylight saving time.
Most of Arizona stays on MST all year and does not switch to MDT. For Phoenix, pick America/Phoenix in the converter.
MDT is 11 hours 30 minutes behind IST for most of the year (238 days in 2026). The gap is 12 hours 30 minutes for about 18 weeks in 2026.
Denver uses Mountain Time. MDT is 11 hours 30 minutes behind IST for most of the year (238 days in 2026). The gap is 12 hours 30 minutes for about 18 weeks in 2026. Type any IST time into the IST to MST converter to see the Denver time for any date.
9:00 AM IST is 9:30 PM (previous day) MDT for most of the year (238 days in 2026). 9:00 AM IST is 8:30 PM (previous day) MST for about 18 weeks in 2026.
12:00 PM IST is 12:30 AM MDT for most of the year (238 days in 2026). 12:00 PM IST is 11:30 PM (previous day) MST for about 18 weeks in 2026.
10:00 AM IST is 10:30 PM (previous day) MDT for most of the year (238 days in 2026). 10:00 AM IST is 9:30 PM (previous day) MST for about 18 weeks in 2026.
5:00 PM IST is 5:30 AM MDT for most of the year (238 days in 2026). 5:00 PM IST is 4:30 AM MST for about 18 weeks in 2026.
No, MST is behind IST. MDT is 11 hours 30 minutes behind IST for most of the year (238 days in 2026). The gap is 12 hours 30 minutes for about 18 weeks in 2026.
Working days of 9 AM to 5 PM do not overlap. The least disruptive slot is around 4:30 PM IST, which is 5:00 AM MDT while IST and MDT apply.
Mountain Time changes its clocks twice a year; India Standard Time does not. The next change is on Sunday, November 1, 2026 in Mountain Time.
IST can also stand for Irish Standard Time or Israel Standard Time. On this site IST always means India Standard Time (Asia/Kolkata).
Most of Arizona stays on MST all year and does not switch to MDT. For Phoenix, pick America/Phoenix in the converter.