India Standard Time (ist) is used in India. The IANA timezone identifier is Asia/Kolkata.

Mountain Standard Time (mst) is used in USA. The IANA timezone identifier is America/Denver.

IST to MST Time Converter

India Standard Time → Mountain Standard Time

IST = UTC+5:30MST = UTC-6

⚠️ IST is ambiguous — on this page it means India Standard Time. It also refers to:

Ireland Standard Time (Dublin) → MST ↗Israel Standard Time (Jerusalem) → MST ↗

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

MST (Denver)

USA · -11.5h🔔 Public Holiday in 5d — Juneteenth National Independence Day

21:30-1 day

London

United Kingdom · -4.5h

04:30

New York

USA · -9.5h

23:30-1 day

Tokyo

Japan · +3.5h

12:30

Dubai

United Arab Emirates · -1.5h

07:30

IST (Mumbai) to MST (Denver) — exact time difference

IST (Mumbai) is 11 hours 30 minutes ahead of MST (Denver). Midday in IST (Mumbai) lines up with 00:00 in MST (Denver).

IST (Mumbai) runs on Asia/Kolkata; MST (Denver) runs on America/Denver. Together they are 11.5 hours 30 minutes apart.

Working hours overlap

There is no business hours overlap between IST (Mumbai) and MST (Denver) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.

Best times to schedule a meeting

IST (Mumbai) and MST (Denver) have no shared working window. These slots minimize out-of-hours disruption for both sides.

04:00 Mumbai / 16:00 Denver⚡ One side off-hours

⚠️ 5h before working hours in Mumbai

09:00 Mumbai / 21:00 Denver⚡ One side off-hours

⚠️ 5h after working hours in Denver

16:00 Mumbai / 04:00 Denver⚡ One side off-hours

⚠️ 5h before working hours in Denver

Working hours defined as 09:00–17:00 local time for each location.

Upcoming public holidays

IST (Mumbai)

No upcoming public holidays this year.

MST (Denver)8 holidays

Jun 19Juneteenth National Independence DaySOON

Jul 3Independence Day

Sep 7Labour Day

Oct 12Columbus Day

Oct 12Indigenous Peoples' Day

How to work with IST (Mumbai) and MST (Denver) time zones

Working across IST (Mumbai) (India) and MST (Denver) (USA) is a challenge — the 11.5-hour difference means no shared business hours window under a standard schedule. Flexibility from at least one side is required.

💡 How to schedule across these time zones

⚡

A 04:00 meeting in IST (Mumbai) means 16:00 in MST (Denver) (5h before working hours in Mumbai).

⚡

A 09:00 meeting in IST (Mumbai) means 21:00 in MST (Denver) (5h after working hours in Denver).

⚡

A 16:00 meeting in IST (Mumbai) means 04:00 in MST (Denver) (5h before working hours in Denver).

Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.

Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.

Add to your browser — Free →

Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am IST (Mumbai)".

IST (Mumbai) ↔ MST (Denver)

No overlap — one side will join outside working hours

IST (Mumbai)

MST (Denver)