TimeToZone

IST to HST Converter

HST is 15 hours 30 minutes behind IST. 9:00 AM IST = 5:30 PM HST (previous day).

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ISTfrom
India Standard Time
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HST
Hawaii-Aleutian Standard Time
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HST is 15 hours 30 minutes behind IST. To convert IST to HST, subtract 15 hours 30 minutes from the IST time: 9:00 AM IST = 5:30 PM HST (previous day).

IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time). HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time).

IST here means India Standard Time, not Irish or Israel Standard Time.

IST to HST time conversion table

IST to HST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

ISTHSTDay
12:00 AM IST8:30 AM HSTprevious day
1:00 AM IST9:30 AM HSTprevious day
2:00 AM IST10:30 AM HSTprevious day
3:00 AM IST11:30 AM HSTprevious day
4:00 AM IST12:30 PM HSTprevious day
5:00 AM IST1:30 PM HSTprevious day
6:00 AM IST2:30 PM HSTprevious day
7:00 AM IST3:30 PM HSTprevious day
8:00 AM IST4:30 PM HSTprevious day
9:00 AM IST5:30 PM HSTprevious day
10:00 AM IST6:30 PM HSTprevious day
11:00 AM IST7:30 PM HSTprevious day
12:00 PM IST8:30 PM HSTprevious day
1:00 PM IST9:30 PM HSTprevious day
2:00 PM IST10:30 PM HSTprevious day
3:00 PM IST11:30 PM HSTprevious day
4:00 PM IST12:30 AM HSTnight
5:00 PM IST1:30 AM HSTnight
6:00 PM IST2:30 AM HSTnight
7:00 PM IST3:30 AM HSTnight
8:00 PM IST4:30 AM HSTnight
9:00 PM IST5:30 AM HSTnight
10:00 PM IST6:30 AM HST—
11:00 PM IST7:30 AM HST—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert IST to HST

Subtract 15 hours 30 minutes from the IST time to get HST.

Example: 9:00 AM IST = 5:30 PM HST (previous day).

Across midnight: 1:00 AM IST = 9:30 AM HST (previous day). The date changes, so always check the day as well as the hour.

Time difference between IST and HST

The time difference between IST and HST is 15 hours 30 minutes all year – HST is behind IST.

IST and HST during daylight saving time

  • IST does not observe daylight saving time; it stays on UTC+5:30 all year.
  • HST does not observe daylight saving time; it stays on UTC−10 all year.

Best time for a meeting between IST and HST

IST and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IST, which is 3:30 PM HST.

Plan a meeting across more time zones.

IST to HST FAQ

What is the time difference between IST and HST?

HST is 15 hours 30 minutes behind IST all year. 9:00 AM IST = 5:30 PM HST (previous day).

What is 9 AM IST in HST?

9:00 AM IST is 5:30 PM HST (previous day).

What is 12 PM (noon) IST in HST?

12:00 PM IST is 8:30 PM HST (previous day).

Is HST ahead of or behind IST?

HST is 15 hours 30 minutes behind IST, so it is earlier in HST than in IST.

Does IST change for daylight saving time?

No. IST stays on the same offset all year, so conversions never shift for daylight saving time.

Does HST change for daylight saving time?

No. HST stays on the same offset all year, so conversions never shift for daylight saving time.

What is the best time for a meeting between IST and HST?

IST and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM IST, which is 3:30 PM HST.

Related conversions

Convert HST to IST

Convert IST to other time zones

Convert other time zones to HST

Learn more

Updated 7 November 2026. Time zone data: IANA tz database.