IST to HAST Converter
HAST is not used on this date
This converter keeps HAST at UTC−10. Adak uses HDT (UTC−9) on this date. Open the HDT converter.Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
5:30 pm17:30 IST (UTC+5:30), Oct 17, 2026 = 2:00 am02:00 HAST (UTC-10), Oct 17, 2026
IST is 15 hours and 30 minutes ahead of HAST.
IST and HAST examples
These examples always use IST (UTC+5:30) and HAST (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 HAST.
How the time difference changes
IST is 15 hours and 30 minutes ahead of HAST 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 HAST.Working hours of 09:00 to 18:00 in IST correspond to 17:30 (previous day) to 02:30 in HAST.
Compare IST time with HAST 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-Aleutian Standard Time.
5:30 pm17:30 in IST is 2:00 am02:00 in HAST
IST to HAST 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 HAST (previous day)
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
2:00 am02:00 Hawaii-Aleutian Standard Time (HAST). Offset UTC -10:00 hours
5:30 pm17:30 IST / 2:00 am02:00 HAST
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.
| IST | HAST |
|---|---|
| 8:30am previous day | |
| 9:30am previous day | |
| 10:30am previous day | |
| 11:30am previous day | |
| 12:30pm previous day | |
| 1:30pm previous day | |
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| 3:30pm previous day | |
| 4:30pm previous day | |
| 5:30pm previous day | |
| 6:30pm previous day | |
| 7:30pm previous day | |
| 8:30pm previous day | |
| 9:30pm previous day | |
| 10:30pm previous day | |
| 11:30pm previous day | |
| 12:30am | |
| 1:30am | |
| 2:30am | |
| 3:30am | |
| 4:30am | |
| 5:30am | |
| 6:30am | |
| 7:30am | |
| 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 | |
| 20:30 previous day | |
| 21:30 previous day | |
| 22:30 previous day | |
| 23:30 previous day | |
| 00:30 | |
| 01:30 | |
| 02:30 | |
| 03:30 | |
| 04:30 | |
| 05:30 | |
| 06:30 | |
| 07:30 |
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
- +0530 - basic
- +05:30 - extended
- +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.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2
Hawaii-Aleutian Standard Time
Offset: HAST is 10 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Today the shaded areas are on UTC−9 (HDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Hawaii-Aleutian Daylight Time (HADT).
End: Hawaii-Aleutian Standard Time (HAST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Hawaii-Aleutian Standard Time (HAST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
See USA daylight saving time and upcoming clock changes worldwide.
HAST representations, usage and related time zones
- -10 - basic short
- -1000 - basic
- -10:00 - extended
- -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.
- Whiskey - Military abbreviation for HAST
- W - short form of 'Whiskey'
- HAST - Hawaii-Aleutian Standard Time
- CKT - Cook Island Time
- HST - Hawaii Standard Time
- TAHT - Tahiti Time
- W - Whiskey Time Zone