IST to JST Converter
JST is 3 hours and 30 minutes ahead of IST
IST to JST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in JST
| IST | JST |
|---|---|
| 12:00 AM | 3:30 AM |
| 1:00 AM | 4:30 AM |
| 2:00 AM | 5:30 AM |
| 3:00 AM | 6:30 AM |
| 4:00 AM | 7:30 AM |
| 5:00 AM | 8:30 AM |
| 6:00 AM | 9:30 AM |
| 7:00 AM | 10:30 AM |
| 8:00 AM | 11:30 AM |
| 9:00 AM | 12:30 PM |
| 10:00 AM | 1:30 PM |
| 11:00 AM | 2:30 PM |
| 12:00 PM | 3:30 PM |
| 1:00 PM | 4:30 PM |
| 2:00 PM | 5:30 PM |
| 3:00 PM | 6:30 PM |
| 4:00 PM | 7:30 PM |
| 5:00 PM | 8:30 PM |
| 6:00 PM | 9:30 PM |
| 7:00 PM | 10:30 PM |
| 8:00 PM | 11:30 PM |
| 9:00 PM | 12:30 AM +1d |
| 10:00 PM | 1:30 AM +1d |
| 11:00 PM | 2:30 AM +1d |
Converting India Standard Time to Japan Standard Time
India Standard Time (IST) and Japan Standard Time (JST) are separated by a 3 hours and 30 minutes time difference. JST is 3 hours and 30 minutes ahead of IST. IST is UTC+5:30, used in India, Sri Lanka, while JST is UTC+9, used in Japan.
When converting from IST to JST, the key reference points to remember are: 9:00 AM IST equals 12:30 PM JST, 12:00 PM noon IST equals 3:30 PM JST, and 5:00 PM IST equals 8:30 PM JST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across IST and JST
For professionals scheduling meetings between IST and JST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 3 hours and 30 minutes difference, the window of overlap may be limited. 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. JST does not observe DST, staying at UTC+9 year-round.