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IST
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CDT
UTC−4
9h 30m behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

5:30 pm17:30 IST (UTC+5:30), Oct 27, 2026 = 8:00 am08:00 CDT (UTC-4), Oct 27, 2026

IST is 9 hours and 30 minutes ahead of CDT.

IST and CDT examples

These examples always use IST (UTC+5:30) and CDT (UTC-4). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

IST is 9 hours and 30 minutes ahead of CDT.

How the time difference changes

For most of the year, IST is 9 hours and 30 minutes ahead of CDT Caribbean. From Nov 1, 2026 to Mar 14, 2027, IST is 10 hours and 30 minutes ahead of CST Caribbean.

For most of the year, working hours of 9:00 am to 6:00 pm in IST correspond to 11:30 pm (previous day) to 8:30 am in CDT Caribbean. At other times of the year, working hours of 9:00 am to 6:00 pm in IST correspond to 10:30 pm (previous day) to 7:30 am in CST Caribbean.For most of the year, working hours of 09:00 to 18:00 in IST correspond to 23:30 (previous day) to 08:30 in CDT Caribbean. At other times of the year, working hours of 09:00 to 18:00 in IST correspond to 22:30 (previous day) to 07:30 in CST Caribbean.

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

Time Difference

India Standard Time is 9 hours and 30 minutes ahead of Cuba Daylight Time.
5:30 pm17:30 in IST is 8:00 am08:00 in CDT

IST to CDT call time
Best time for a conference call or a meeting is between 6pm-7pm18:00-19:00 in IST which corresponds to 8:30am-9:30am08:30-09:30 in CDT. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.

5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
8:00 am08:00 Cuba Daylight Time (CDT). Offset UTC -4:00 hours

5:30 pm17:30 IST / 8:00 am08:00 CDT

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Hourly time comparison
ISTCDT
2:30pm previous day
3:30pm previous day
4:30pm previous day
5:30pm previous day
6:30pm previous day
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8:30pm previous day
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14:30 previous day
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17:30 previous day
18:30 previous day
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20:30 previous day
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23:30 previous day
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India Standard Time

Offset: IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).

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, Bengaluru, Hyderabad, Ahmedabad.

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; see upcoming clock changes worldwide.

Current time in India: India time now

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

Cuba Daylight Time

Offset: CDT is 4 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: Cuba

Principal Cities: The largest city in the CDT time zone is Havana in Cuba, with about 2.164 million people. Other major cities in this time zone include Santiago de Cuba, Camagüey, Holguín, Guantánamo.

Map of the areas on Cuba Daylight Time (CDT)
CDT part of the year

Today all shaded areas are on CDT.

Daylight Saving: Cuba Daylight Time (CDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Cuba Standard Time (CST).

123456789101112Start: Cuba Daylight Time (CDT) started on Sunday, March 8, 2026 at 12:00 am00:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 1:00 am01:00. Daylight saving starts annually on the second Sunday of March.

123456789101112End: Cuba Daylight Time (CDT) ends on Sunday, November 1, 2026 at 1:00 am01:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 12:00 am00:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.

See Cuba daylight saving time and upcoming clock changes worldwide.

CDT 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 an offset of four hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Quebec - Military abbreviation for CDT
  • Q - short form of 'Quebec'
IANA/Olson: Reflects CDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Havana
  • Cuba
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 -4 offset:
  • AST - Atlantic Standard Time
  • EDT - Eastern Daylight Time
  • AMT - Amazon Time
  • BOT - Bolivia Time
  • CDT - Cuba Daylight Time
  • CLT - Chile Standard Time
  • GYT - Guyana Time
  • HLV - Hora Legal de Venezuela
  • Q - Quebec Time Zone
  • VET - Venezuelan Standard Time