IST to HST
Hawaii Time (HST) is 15 hours 30 minutes behind India Standard Time (IST) all year: 9:00 AM IST is 5:30 PM HST the previous day.
HST vs IST over the next 12 months
| Period | HST is | Example |
|---|---|---|
| Oct 23, 2026 onwards | 15 hours 30 minutes behind | 9:00 AM IST = 5:30 PM HST (previous day) |
IST to HST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| India Standard Time | Hawaii Time |
|---|---|
| 12:00 AM | 8:30 AM (previous day) |
| 1:00 AM | 9:30 AM (previous day) |
| 2:00 AM | 10:30 AM (previous day) |
| 3:00 AM | 11:30 AM (previous day) |
| 4:00 AM | 12:30 PM (previous day) |
| 5:00 AM | 1:30 PM (previous day) |
| 6:00 AM | 2:30 PM (previous day) |
| 7:00 AM | 3:30 PM (previous day) |
| 8:00 AM | 4:30 PM (previous day) |
| 9:00 AM | 5:30 PM (previous day) |
| 10:00 AM | 6:30 PM (previous day) |
| 11:00 AM | 7:30 PM (previous day) |
| 12:00 PM | 8:30 PM (previous day) |
| 1:00 PM | 9:30 PM (previous day) |
| 2:00 PM | 10:30 PM (previous day) |
| 3:00 PM | 11:30 PM (previous day) |
| 4:00 PM | 12:30 AM |
| 5:00 PM | 1:30 AM |
| 6:00 PM | 2:30 AM |
| 7:00 PM | 3:30 AM |
| 8:00 PM | 4:30 AM |
| 9:00 PM | 5:30 AM |
| 10:00 PM | 6:30 AM |
| 11:00 PM | 7:30 AM |
Best time for a meeting
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours 30 minutes on a weekday: 8:00 AM–11:30 AM IST, which is 4:30 PM–8:00 PM HST.
Comparing more than two places? The meeting planner lines up working hours for up to six cities.
Daylight saving time
Neither IST nor HST changes its clocks, so the difference is the same all year.
Where these clocks are used
- India Standard Time (IST): all of India: Mumbai, Delhi, Bengaluru, Chennai. IANA zone
Asia/Kolkata. - Hawaii Time (HST): Hawaii, which does not observe daylight saving time. IANA zone
Pacific/Honolulu.
Questions
What time is it in HST when it is 9 AM IST?
On Oct 23, 2026, 9:00 AM IST is 5:30 PM HST the previous day.
How many hours behind IST is HST?
HST is always 15 hours 30 minutes behind IST.
Do IST and HST observe daylight saving time?
India Standard Time stays on UTC+5:30 all year. Hawaii Time stays on UTC−10 all year.
What is the best time for a meeting between IST and HST?
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours 30 minutes on a weekday: 8:00 AM–11:30 AM IST, which is 4:30 PM–8:00 PM HST.
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Related conversions
- HST to IST (reverse)
- IST to EST
- IST to CST
- IST to MST
- IST to PST
- IST to UTC
- IST to GMT
- IST to CET
- IST to SGT
- IST to JST
- IST to AEST
- IST to AKST
- All time zones
Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.