IST
India Standard Time
GMT +5:30
CST/CDT
Central Standard Time
GMT -6
CDT automatically adjusted to CST time zone, that is in use

Time Difference

India Standard Time is 11 hours and 30 minutes ahead of Central Standard Time
7:30 pm19:30 in IST is 8:00 am08:00 in CST

IST to CDT 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 CDT

7:30 pm19:30 India Standard Time (IST). Offset UTC +5:30 hours
8:00 am08:00 Central Standard Time (CST). Offset UTC -6:00 hours

7:30 pm19:30 IST / 8:00 am08:00 CST

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

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

Central Daylight Time

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

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

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

French: HAC - Heure Avancée du Centre

Spanish: CT - Zona Centro

CDT Time Zone Geo Map
CDT timezone map

Daylight Saving: Central Daylight Time (CDT) is a daylight saving/summer time zone, however during winter some places adjust time for one hour back and observe Central Standard Time (CST).

Daylight saving time clock moves back for one hour from 2am to 1amEnd: Central Daylight Time (CDT) has ended on Sunday, November 6, 2022 at 2:00 am local time and clocks were set one hour back to Sunday, November 6, 2022, 1:00 am local standard time instead. Daylight saving ends annually the on first Sunday of November

Daylight saving time clock moves forward for one hour from 2am to 3amStart: Central Daylight Time (CDT) starts on Sunday, March 12, 2023 at 2:00 am local time and clocks are set one hour forward to Sunday, March 12, 2023, 3:00 am. Daylight saving starts annually the on second Sunday of March

CDT 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 CDT
  • R - short form of 'Romeo'
IANA/Olson: Reflects CDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Bahia_Banderas
  • America/Chicago
  • America/Indiana/Knox
  • America/Indiana/Tell_City
  • America/Knox_IN
  • America/Matamoros
  • America/Menominee
  • America/Merida
  • America/Mexico_City
  • America/Monterrey
  • America/North_Dakota/Beulah
  • America/North_Dakota/Center
  • America/North_Dakota/New_Salem
  • America/Rainy_River
  • America/Rankin_Inlet
  • America/Resolute
  • America/Winnipeg
  • CST6CDT
  • Canada/Central
  • Mexico/General
  • US/Central
  • US/Indiana-Starke
CDT Abbreviation: Several time zones share CDT abbreviation and it could refer to these time zones
  • Central Daylight Time - UTC -5
  • Cuba Daylight Time - UTC -4
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