IST to MDT Converter & Meeting Planner
Quick answer: 9:00 AM IST = 9:30 PM MDT (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Mountain Daylight Time (MDT)? You need to account for the standard time difference. Mountain Daylight Time is normally 11.5 hours behind Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and Denver and Salt Lake City, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 12:30 PM MDT. The full 24-hour IST to MDT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 3:30 AM MDT.
| IST Time | MDT Time |
|---|---|
| 12:00 AM (00:00) | 12:30 PM (12:30)-1 day |
| 1:00 AM (01:00) | 1:30 PM (13:30)-1 day |
| 2:00 AM (02:00) | 2:30 PM (14:30)-1 day |
| 3:00 AM (03:00) | 3:30 PM (15:30)-1 day |
| 4:00 AM (04:00) | 4:30 PM (16:30)-1 day |
| 5:00 AM (05:00) | 5:30 PM (17:30)-1 day |
| 6:00 AM (06:00) | 6:30 PM (18:30)-1 day |
| 7:00 AM (07:00) | 7:30 PM (19:30)-1 day |
| 8:00 AM (08:00) | 8:30 PM (20:30)-1 day |
| 9:00 AM (09:00) | 9:30 PM (21:30)-1 day |
| 10:00 AM (10:00) | 10:30 PM (22:30)-1 day |
| 11:00 AM (11:00) | 11:30 PM (23:30)-1 day |
| 12:00 PM (12:00) | 12:30 AM (00:30) |
| 1:00 PM (13:00) | 1:30 AM (01:30) |
| 2:00 PM (14:00) | 2:30 AM (02:30) |
| 3:00 PM (15:00) | 3:30 AM (03:30) |
| 4:00 PM (16:00) | 4:30 AM (04:30) |
| 5:00 PM (17:00) | 5:30 AM (05:30) |
| 6:00 PM (18:00) | 6:30 AM (06:30) |
| 7:00 PM (19:00) | 7:30 AM (07:30) |
| 8:00 PM (20:00) | 8:30 AM (08:30) |
| 9:00 PM (21:00) | 9:30 AM (09:30) |
| 10:00 PM (22:00) | 10:30 AM (10:30) |
| 11:00 PM (23:00) | 11:30 AM (11:30) |
Best time to call Denver from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in Denver (MDT). IST commonly covers South Asia, while MDT is mainly associated with North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 8:30 PM IST, which reaches 9:00 AM MDT near the start of their workday.
- DST Safety: IST or MDT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
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Frequently Asked Questions
What is the time difference between IST and MDT?
During standard time, Mountain Daylight Time is 11.5 hours behind Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
When does MDT start and end?
MDT begins on the second Sunday in March at 02:00 local MST time, when clocks spring forward one hour from MST (UTC-7) to MDT (UTC-6). It ends on the first Sunday in November at 02:00 local MDT time, when clocks fall back to MST. In 2026, MDT runs from March 8 through November 1, covering the majority of the calendar year.
Is Arizona on MDT?
Most of Arizona — including Phoenix and Tucson — does not observe Daylight Saving Time and remains on MST (UTC-7) year-round under a state law in effect since 1968, meaning Arizona does not advance to MDT each March. The significant exception is the Navajo Nation, a sovereign territory spanning parts of northeastern Arizona, southeastern Utah, and northwestern New Mexico, which does observe DST and shifts to MDT on the standard federal schedule.