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IST to MST Converter

IST
India Standard Time
GMT +5:30
12am
3am
6am
9am
12pm
3pm
6pm
9pm
MST
Mountain Standard Time
GMT -7
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

IST is 12 hours and 30 minutes ahead of MST. IST uses GMT +5:30, and MST uses GMT -7 for this comparison.

For example, 5:30 pm IST is 5:00 am MST. Use the converter above to adjust the date or time and create a shareable meeting link.

Best meeting overlap: 7am-8am IST, which is 6:30pm-7:30pm MST (previous day).

MST is a fixed UTC-7 standard-time offset. For current Mountain Time, compare IST to MDT.

Compare IST time with MST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

India Standard Time is 12 hours and 30 minutes ahead of Mountain Standard Time
5:30 pm17:30 in IST is 5:00 am05:00 in MST

IST to MST call time
Best time for a conference call or a meeting is between 7am-8am in IST which corresponds to 6:30pm-7:30pm in MST (previous day)

5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
5:00 am05:00 Mountain Standard Time (MST). Offset UTC -7:00 hours

5:30 pm17:30 IST / 5:00 am05:00 MST

ISTMST
12am (midnight)11:30 am
1am12:30 pm
2am1:30 pm
3am2:30 pm
4am3:30 pm
5am4:30 pm
6am5:30 pm
7am6:30 pm
8am7:30 pm
9am8:30 pm
10am9:30 pm
11am10:30 pm
12pm (noon)11:30 pm
1pm12:30 am
2pm1:30 am
3pm2:30 am
4pm3:30 am
5pm4:30 am
6pm5:30 am
7pm6:30 am
8pm7:30 am
9pm8:30 am
10pm9:30 am
11pm10:30 am
00:0011:30
01:0012:30
02:0013:30
03:0014:30
04:0015:30
05:0016:30
06:0017:30
07:0018:30
08:0019:30
09:0020:30
10:0021:30
11:0022:30
12:0023:30
13:0000:30
14:0001:30
15:0002:30
16:0003:30
17:0004:30
18:0005:30
19:0006:30
20:0007:30
21:0008:30
22:0009:30
23:0010:30

India Standard Time

Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia

Countries using this time zone: India

Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bangalore, Kolkata, Chennai.

Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.

IST Time Zone Geo Map
IST timezone map

IST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +0530 - basic
  • +05:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
IANA/Olson: Reflects IST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Calcutta
  • Asia/Kolkata
IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones
  • India Standard Time - UTC +5:30
  • Irish Standard Time - UTC +1
  • Israel Standard Time - UTC +2

Mountain Standard Time

Offset: MST is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries using this time zone: Canada, Mexico, United States

Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.446 million people. Other major cities in this time zone include Calgary, Edmonton, El Paso, Denver.

French: HNR - Heure Normale des Rocheuses

Spanish: MT - Zona Pacífico

MST Time Zone Geo Map
MST timezone map

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).

Daylight saving time clock moves back for one hour from 2am to 1amStart: Mountain Standard Time (MST) started on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually on the first Sunday of November.

Daylight saving time clock moves forward for one hour from 2am to 3amEnd: Mountain Standard Time (MST) ends on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am local daylight time instead. Standard time ends annually on the second Sunday of March.

MST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -07 - basic short
  • -0700 - basic
  • -07:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Tango - Military abbreviation for MST
  • T - short form of 'Tango'
IANA/Olson: Reflects MST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Boise
  • America/Cambridge_Bay
  • America/Ciudad_Juarez
  • America/Creston
  • America/Dawson
  • America/Dawson_Creek
  • America/Denver
  • America/Edmonton
  • America/Fort_Nelson
  • America/Hermosillo
  • America/Inuvik
  • America/Mazatlan
  • America/Phoenix
  • America/Shiprock
  • America/Whitehorse
  • America/Yellowknife
  • Canada/Mountain
  • Canada/Yukon
  • MST
  • MST7MDT
  • Mexico/BajaSur
  • Navajo
  • US/Arizona
  • US/Mountain
Time zones with the GMT -7 offset:
  • MST - Mountain Standard Time
  • PDT - Pacific Daylight Time
  • YST - Yukon Standard Time
  • T - Tango Time Zone
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT