HST to IST Converter
IST is 15 hours and 30 minutes ahead of HST
HST to IST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in IST
| HST | IST |
|---|---|
| 12:00 AM | 3:30 PM |
| 1:00 AM | 4:30 PM |
| 2:00 AM | 5:30 PM |
| 3:00 AM | 6:30 PM |
| 4:00 AM | 7:30 PM |
| 5:00 AM | 8:30 PM |
| 6:00 AM | 9:30 PM |
| 7:00 AM | 10:30 PM |
| 8:00 AM | 11:30 PM |
| 9:00 AM | 12:30 AM +1d |
| 10:00 AM | 1:30 AM +1d |
| 11:00 AM | 2:30 AM +1d |
| 12:00 PM | 3:30 AM +1d |
| 1:00 PM | 4:30 AM +1d |
| 2:00 PM | 5:30 AM +1d |
| 3:00 PM | 6:30 AM +1d |
| 4:00 PM | 7:30 AM +1d |
| 5:00 PM | 8:30 AM +1d |
| 6:00 PM | 9:30 AM +1d |
| 7:00 PM | 10:30 AM +1d |
| 8:00 PM | 11:30 AM +1d |
| 9:00 PM | 12:30 PM +1d |
| 10:00 PM | 1:30 PM +1d |
| 11:00 PM | 2:30 PM +1d |
Converting Hawaii Standard Time to India Standard Time
Hawaii Standard Time (HST) and India Standard Time (IST) are separated by a 15 hours and 30 minutes time difference. IST is 15 hours and 30 minutes ahead of HST. HST is UTC-10, used in United States, while IST is UTC+5:30, used in India, Sri Lanka.
When converting from HST to IST, the key reference points to remember are: 9:00 AM HST equals 12:30 AM IST, 12:00 PM noon HST equals 3:30 AM IST, and 5:00 PM HST equals 8:30 AM IST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across HST and IST
For professionals scheduling meetings between HST and IST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 15 hours and 30 minutes difference, the window of overlap may be limited, making early morning or late evening calls necessary for one party. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
HST does not observe Daylight Saving Time, maintaining UTC-10 year-round. IST does not observe DST, staying at UTC+5:30 year-round.