IST
India Standard Time
GMT +5:30
CST
Cuba Standard Time
GMT -5

Time Difference

India Standard Time is 10 hours and 30 minutes ahead of Cuba Standard Time
8:00 pm20:00 in IST is 9:30 am09:30 in CST

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

8:00 pm20:00 India Standard Time (IST). Offset UTC +5:30 hours
9:30 am09:30 Cuba Standard Time (CST). Offset UTC -5:00 hours

8:00 pm20:00 IST / 9:30 am09:30 CST

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

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
  • Iran Standard Time - UTC +3:30

Cuba Standard Time

Offset: CST is 5 hours behind Greenwich Mean Time (GMT) and is used in Caribbean

Countries: It is used in following countries: Canada, Cuba, Mexico, United States

Principal Cities: The largest city in the CST timezone is Mexico City from Mexico with population about 12.294 million people. Other major cities in the area are Chicago, Havana, Houston, Iztapalapa

CST Time Zone Geo Map
CST timezone map

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 Central Daylight Time (CDT).

Daylight saving time clock moves back for one hour from 1am to 12amStart: Cuba Standard Time (CST) started on Sunday, November 6, 2022 at 1:00 am local time and clocks were set one hour back to Sunday, November 6, 2022, 12:00 am. Standard time starts annually the on first Sunday of November.

Daylight saving time clock moves forward for one hour from 12am to 1amEnd: Cuba Standard Time (CST) ends on Sunday, March 12, 2023 at 12:00 am local time and clocks are set one hour forward to Sunday, March 12, 2023, 1:00 am local daylight time instead. Standard time starts annually the on second Sunday of March.

CST 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 CST
  • R - short form of 'Romeo'
IANA/Olson: Reflects CST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Havana
  • Cuba
CST Abbreviation: Several time zones share CST abbreviation and it could refer to these time zones
  • Central Standard Time - UTC -6
  • China Standard Time - UTC +8
  • Cuba Standard Time - UTC -5
  • Colombia Standard Time - UTC -5
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