IST to HST Converter
HST is 15 hours and 30 minutes behind IST
IST to HST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in HST
| IST | HST |
|---|---|
| 12:00 AM | 8:30 AM -1d |
| 1:00 AM | 9:30 AM -1d |
| 2:00 AM | 10:30 AM -1d |
| 3:00 AM | 11:30 AM -1d |
| 4:00 AM | 12:30 PM -1d |
| 5:00 AM | 1:30 PM -1d |
| 6:00 AM | 2:30 PM -1d |
| 7:00 AM | 3:30 PM -1d |
| 8:00 AM | 4:30 PM -1d |
| 9:00 AM | 5:30 PM -1d |
| 10:00 AM | 6:30 PM -1d |
| 11:00 AM | 7:30 PM -1d |
| 12:00 PM | 8:30 PM -1d |
| 1:00 PM | 9:30 PM -1d |
| 2:00 PM | 10:30 PM -1d |
| 3:00 PM | 11:30 PM -1d |
| 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 |
Converting India Standard Time to Hawaii Standard Time
India Standard Time (IST) and Hawaii Standard Time (HST) are separated by a 15 hours and 30 minutes time difference. HST is 15 hours and 30 minutes behind IST. IST is UTC+5:30, used in India, Sri Lanka, while HST is UTC-10, used in United States.
When converting from IST to HST, the key reference points to remember are: 9:00 AM IST equals 5:30 PM HST, 12:00 PM noon IST equals 8:30 PM HST, and 5:00 PM IST equals 1:30 AM HST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across IST and HST
For professionals scheduling meetings between IST and HST, 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
IST does not observe Daylight Saving Time, maintaining UTC+5:30 year-round. HST does not observe DST, staying at UTC-10 year-round.