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GST to IST to EST

GST
Gulf Standard Time
GMT +4
IST
India Standard Time
GMT +5:30
EDT/EST
Eastern Daylight Time
GMT -4
EST automatically adjusted to EDT time zone, that is in use

Time Difference

Gulf Standard Time is 1 hours and 30 minutes behind India Standard Time and 8 hours ahead of Eastern Daylight Time
4:30 pm16:30 in GST is 6:00 pm18:00 in IST and is 8:30 am08:30 in EDT

GST to IST call time
Best time for a conference call or a meeting is between 8am-4:30pm in GST which corresponds to 9:30am-6pm in IST
GST to EST call time
Best time for a conference call or a meeting is between 5pm-7pm in GST which corresponds to 8am-10am in EST

4:30 pm16:30 Gulf Standard Time (GST). Offset UTC +4:00 hours
6:00 pm18:00 India Standard Time (IST). Offset UTC +5:30 hours
8:30 am08:30 Eastern Daylight Time (EDT). Offset UTC -4:00 hours

4:30 pm16:30 GST / 6:00 pm18:00 IST / 8:30 am08:30 EDT

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

Gulf Standard Time

Offset: GST is 4 hours ahead Greenwich Mean Time (GMT) and is used in Asia

GST Time Zone Geo Map
GST timezone map

GST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +04 - basic short
  • +0400 - basic
  • +04:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0400 - sign character (+) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates four hour and zero minutes time differences to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Delta - Military abbreviation for GST
  • D - short form of 'Delta'
Time zones with the GMT +4 offset:
  • KUYT - Kuybyshev Time
  • MSD - Moscow Daylight Time
  • SAMT - Samara Time
  • AMT - Armenia Time
  • AZT - Azerbaijan Time
  • D - Delta Time Zone
  • GET - Georgia Standard Time
  • GST - Gulf Standard Time
  • MUT - Mauritius Time
  • RET - Reunion Time
  • SCT - Seychelles Time

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
  • Iran Standard Time - UTC +3:30

Eastern Standard Time

Offset: EST is 5 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Bahamas, Canada, Haiti, Jamaica, Cayman Islands, Mexico, Panama, Turks & Caicos Is, United States

Principal Cities: The largest city in the EST timezone is New York City from USA with population about 8.175 million people. Other major cities in the area are Toronto, Montreal, Brooklyn, Borough of Queens

French: HNE - Heure Normale de l'Est

Spanish: ET - Tiempo del Este, ET - Zona Sureste

EST Time Zone Geo Map
EST timezone map

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

Daylight saving time clock moves forward for one hour from 2am to 3amEnd: Eastern Standard Time (EST) has ended on Sunday, March 9, 2025 at 2:00 am local time and clocks were set one hour forward to Sunday, March 9, 2025, 3:00 am local daylight time instead. Standard time ends annually the on second Sunday of March.

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

EST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -05 - basic short
  • -0500 - basic
  • -05:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0500 - sign character (-) followed by a four digit time providing hours (05) and minutes (00) of the offset. Indicates five 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
  • Romeo - Military abbreviation for EST
  • R - short form of 'Romeo'
IANA/Olson: Reflects EST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Atikokan
  • America/Cancun
  • America/Cayman
  • America/Coral_Harbour
  • America/Detroit
  • America/Fort_Wayne
  • America/Grand_Turk
  • America/Indiana/Indianapolis
  • America/Indiana/Marengo
  • America/Indiana/Petersburg
  • America/Indiana/Vevay
  • America/Indiana/Vincennes
  • America/Indiana/Winamac
  • America/Indianapolis
  • America/Iqaluit
  • America/Jamaica
  • America/Kentucky/Louisville
  • America/Kentucky/Monticello
  • America/Louisville
  • America/Montreal
  • America/Nassau
  • America/New_York
  • America/Nipigon
  • America/Panama
  • America/Pangnirtung
  • America/Port-au-Prince
  • America/Thunder_Bay
  • America/Toronto
  • Canada/Eastern
  • EST
  • EST5EDT
  • Jamaica
  • US/East-Indiana
  • US/Eastern
  • US/Michigan
Time zones with the GMT -5 offset:
  • CDT - Central Daylight Time
  • EST - Eastern Standard Time
  • ET - Eastern Time
  • COT - Colombia Time
  • CST - Cuba Standard Time
  • EASST - Easter Island Summer Time
  • ECT - Ecuador Time
  • PET - Peru Time
  • R - Romeo Time Zone
EST to IST GMT to EST PST to EST EST to GMT PST to GMT