HST to IST Converter
IST is 15 hours 30 minutes ahead of HST. 9:00 AM HST = 12:30 AM IST (next day).
IST is 15 hours 30 minutes ahead of HST. To convert HST to IST, add 15 hours 30 minutes to the HST time: 9:00 AM HST = 12:30 AM IST (next day).
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time).
IST here means India Standard Time, not Irish or Israel Standard Time.
HST to IST time conversion table
HST to IST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | IST | Day |
|---|---|---|
| 12:00 AM HST | 3:30 PM IST | — |
| 1:00 AM HST | 4:30 PM IST | — |
| 2:00 AM HST | 5:30 PM IST | — |
| 3:00 AM HST | 6:30 PM IST | — |
| 4:00 AM HST | 7:30 PM IST | — |
| 5:00 AM HST | 8:30 PM IST | — |
| 6:00 AM HST | 9:30 PM IST | — |
| 7:00 AM HST | 10:30 PM IST | night |
| 8:00 AM HST | 11:30 PM IST | night |
| 9:00 AM HST | 12:30 AM IST | next day |
| 10:00 AM HST | 1:30 AM IST | next day |
| 11:00 AM HST | 2:30 AM IST | next day |
| 12:00 PM HST | 3:30 AM IST | next day |
| 1:00 PM HST | 4:30 AM IST | next day |
| 2:00 PM HST | 5:30 AM IST | next day |
| 3:00 PM HST | 6:30 AM IST | next day |
| 4:00 PM HST | 7:30 AM IST | next day |
| 5:00 PM HST | 8:30 AM IST | next day |
| 6:00 PM HST | 9:30 AM IST | next day |
| 7:00 PM HST | 10:30 AM IST | next day |
| 8:00 PM HST | 11:30 AM IST | next day |
| 9:00 PM HST | 12:30 PM IST | next day |
| 10:00 PM HST | 1:30 PM IST | next day |
| 11:00 PM HST | 2:30 PM IST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to IST
Add 15 hours 30 minutes to the HST time to get IST.
Example: 9:00 AM HST = 12:30 AM IST (next day).
Across midnight: 10:00 PM HST = 1:30 PM IST (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and IST
The time difference between HST and IST is 15 hours 30 minutes all year – IST is ahead of HST.
HST and IST during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- IST does not observe daylight saving time; it stays on UTC+5:30 all year.
Best time for a meeting between HST and IST
HST and IST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 4:00 PM HST, which is 7:30 AM IST.
HST to IST FAQ
What is the time difference between HST and IST?
IST is 15 hours 30 minutes ahead of HST all year. 9:00 AM HST = 12:30 AM IST (next day).
What is 9 AM HST in IST?
9:00 AM HST is 12:30 AM IST (next day).
What is 12 PM (noon) HST in IST?
12:00 PM HST is 3:30 AM IST (next day).
Is IST ahead of or behind HST?
IST is 15 hours 30 minutes ahead of HST, so it is later in IST than in HST.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
Does IST change for daylight saving time?
No. IST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between HST and IST?
HST and IST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 4:00 PM HST, which is 7:30 AM IST.
Related conversions
Convert IST to HST
Convert HST to other time zones
Convert other time zones to IST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.