AST to IST Converter
IST is 9 hours and 30 minutes ahead of AST
AST to IST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in IST
| AST | IST |
|---|---|
| 12:00 AM | 9:30 AM |
| 1:00 AM | 10:30 AM |
| 2:00 AM | 11:30 AM |
| 3:00 AM | 12:30 PM |
| 4:00 AM | 1:30 PM |
| 5:00 AM | 2:30 PM |
| 6:00 AM | 3:30 PM |
| 7:00 AM | 4:30 PM |
| 8:00 AM | 5:30 PM |
| 9:00 AM | 6:30 PM |
| 10:00 AM | 7:30 PM |
| 11:00 AM | 8:30 PM |
| 12:00 PM | 9:30 PM |
| 1:00 PM | 10:30 PM |
| 2:00 PM | 11:30 PM |
| 3:00 PM | 12:30 AM +1d |
| 4:00 PM | 1:30 AM +1d |
| 5:00 PM | 2:30 AM +1d |
| 6:00 PM | 3:30 AM +1d |
| 7:00 PM | 4:30 AM +1d |
| 8:00 PM | 5:30 AM +1d |
| 9:00 PM | 6:30 AM +1d |
| 10:00 PM | 7:30 AM +1d |
| 11:00 PM | 8:30 AM +1d |
Converting Atlantic Standard Time to India Standard Time
Atlantic Standard Time (AST) and India Standard Time (IST) are separated by a 9 hours and 30 minutes time difference. IST is 9 hours and 30 minutes ahead of AST. AST is UTC-4, used in Canada, Puerto Rico, US Virgin Islands, while IST is UTC+5:30, used in India, Sri Lanka.
When converting from AST to IST, the key reference points to remember are: 9:00 AM AST equals 6:30 PM IST, 12:00 PM noon AST equals 9:30 PM IST, and 5:00 PM AST equals 2:30 AM IST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across AST and IST
For professionals scheduling meetings between AST 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 9 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
AST observes Daylight Saving Time, switching to ADT (UTC-3) during summer months. IST does not observe DST, staying at UTC+5:30 year-round. During DST transitions, the time difference between these zones may temporarily change by 1 hour. Always verify the current offset during spring and fall transition periods.