IST to HST Converter

Updating current time…
IST
India Standard Time
UTC+5:30
12am
3am
6am
9am
12pm
3pm
6pm
9pm
HST
Hawaii Standard Time
UTC−10
15h 30m behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

5:30 pm17:30 IST (UTC+5:30), Oct 17, 2026 = 2:00 am02:00 HST (UTC-10), Oct 17, 2026

IST is 15 hours and 30 minutes ahead of HST.

IST and HST examples

These examples always use IST (UTC+5:30) and HST (UTC-10). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

IST is 15 hours and 30 minutes ahead of HST.

How the time difference changes

IST is 15 hours and 30 minutes ahead of HST year-round.

Working hours of 9:00 am to 6:00 pm in IST correspond to 5:30 pm (previous day) to 2:30 am in HST.Working hours of 09:00 to 18:00 in IST correspond to 17:30 (previous day) to 02:30 in HST.

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

Time Difference

India Standard Time is 15 hours and 30 minutes ahead of Hawaii Standard Time.
5:30 pm17:30 in IST is 2:00 am02:00 in HST

IST to HST call time
Best time for a conference call or a meeting is between 9am-9:30am09:00-09:30 in IST which corresponds to 5:30pm-6pm17:30-18:00 in HST (previous day)

5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours

5:30 pm17:30 IST / 2:00 am02:00 HST

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
ISTHST
8:30am previous day
9:30am previous day
10:30am previous day
11:30am previous day
12:30pm previous day
1:30pm previous day
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
9:30pm previous day
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11:30pm previous day
12:30am
1:30am
2:30am
3:30am
4:30am
5:30am
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08:30 previous day
09:30 previous day
10:30 previous day
11:30 previous day
12:30 previous day
13:30 previous day
14:30 previous day
15:30 previous day
16:30 previous day
17:30 previous day
18:30 previous day
19:30 previous day
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00:30
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06:30
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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

Map of the areas on India Standard Time (IST)
IST all year

Open the world time zone map© OpenStreetMap

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

Hawaii Standard Time

Offset: HST is 10 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: United States

Principal Cities: The largest city in the HST time zone is Honolulu in the United States, with about 350,964 people. Other major cities in this time zone include Pearl City, Hilo, Kailua, Waipahu.

Daylight Saving: Some places on Hawaii Standard Time (HST) keep the same time all year, while others use HST for only part of the year and change their clocks for daylight saving time; see upcoming clock changes worldwide.

Map of the areas on Hawaii Standard Time (HST)
HST all year HST part of the year

Today the lighter areas are on UTC−9 (HDT).

Open the world time zone map© OpenStreetMap

HST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -10 - basic short
  • -1000 - basic
  • -10:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -1000 - sign character (-) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Whiskey - Military abbreviation for HST
  • W - short form of 'Whiskey'
IANA/Olson: Reflects HST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Adak
  • America/Atka
  • HST
  • Pacific/Honolulu
  • Pacific/Johnston
  • US/Aleutian
  • US/Hawaii
Time zones with the GMT -10 offset:
  • HAST - Hawaii-Aleutian Standard Time
  • CKT - Cook Island Time
  • HST - Hawaii Standard Time
  • TAHT - Tahiti Time
  • W - Whiskey Time Zone
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT