IST
India Standard Time
GMT +5:30
MST
Mountain Standard Time
GMT -7

Time Difference

India Standard Time is 12 hours and 30 minutes ahead of Mountain Standard Time
4:00 am04:00 in IST is 3:30 pm15:30 in MST

IST to MST call time
Best time for a conference call or a meeting is between 7pm-9pm in IST which corresponds to 6:30am-8:30am in MST

4:00 am04:00 India Standard Time (IST). Offset UTC +5:30 hours
3:30 pm15:30 Mountain Standard Time (MST). Offset UTC -7:00 hours

4:00 am04:00 IST / 3:30 pm15:30 MST

IST MST
12am (midnight) 11:30 am
1am 12:30 pm
2am 1:30 pm
3am 2:30 pm
4am 3:30 pm
5am 4:30 pm
6am 5:30 pm
7am 6:30 pm
8am 7:30 pm
9am 8:30 pm
10am 9:30 pm
11am 10:30 pm
12pm (noon) 11:30 pm
1pm 12:30 am
2pm 1:30 am
3pm 2:30 am
4pm 3:30 am
5pm 4:30 am
6pm 5:30 am
7pm 6:30 am
8pm 7:30 am
9pm 8:30 am
10pm 9:30 am
11pm 10:30 am
0:00 11:30
1:00 12:30
2:00 13:30
3:00 14:30
4:00 15:30
5:00 16:30
6:00 17:30
7:00 18:30
8:00 19:30
9:00 20:30
10:00 21:30
11:00 22:30
12:00 23:30
13:00 0:30
14:00 1:30
15:00 2:30
16:00 3:30
17:00 4:30
18:00 5:30
19:00 6:30
20:00 7:30
21:00 8:30
22:00 9:30
23:00 10:30

India Standard Time

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

Countries: It is used in following countries: India

Principal Cities: The largest city in the IST timezone is Mumbai from India with population about 12.692 million people. Other major cities in the area are Delhi, Bangalore, Kolkata, Chennai

Daylight Saving: India Standard Time (IST) is not adjusted for daylight saving therefore IST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, India Standard Time remains the same

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 five hour and thirty minutes time differences 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: It is used in following countries: Canada, Mexico, United States

Principal Cities: The largest city in the MST timezone is Ciudad Juarez from Mexico with population about 1.512 million people. Other major cities in the area are Phoenix, Calgary, Chihuahua, Edmonton

Daylight Saving: This is a standard timezone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Mountain Daylight Time (MDT).

Start: MST started and clocks were set one hour back on Sunday, 01 November 2020, at 2:00 (2:00 am) local time.

End: MST ends and clocks are set one hour forward on Sunday, 14 March 2021, at 2:00 (2:00 am) local time.

French: HNR - Heure Normale des Rocheuses

Spanish: MT - Zona PacĂ­fico

MST Time Zone Geo Map
MST timezone map

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 seven hour and zero minutes time differences 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/Chihuahua
  • America/Creston
  • America/Dawson
  • America/Dawson_Creek
  • America/Denver
  • America/Edmonton
  • America/Fort_Nelson
  • America/Hermosillo
  • America/Inuvik
  • America/Mazatlan
  • America/Ojinaga
  • 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
  • T - Tango Time Zone