IST to AST Converter
AST is 9.5 hours behind of IST.
IST
Friday, October 23, 2026
India Standard Time · UTC+5:30
AST
Thursday, October 22, 2026
Atlantic Standard Time · UTC−4
Convert IST to AST
IST 07:45 = AST 22:15
IST to AST time chart, hour by hour
| IST | AST |
|---|
| 00:00 | 14:30 −1 day |
| 01:00 | 15:30 −1 day |
| 02:00 | 16:30 −1 day |
| 03:00 | 17:30 −1 day |
| 04:00 | 18:30 −1 day |
| 05:00 | 19:30 −1 day |
| 06:00 | 20:30 −1 day |
| 07:00 | 21:30 −1 day |
| 08:00 | 22:30 −1 day |
| 09:00 | 23:30 −1 day |
| 10:00 | 00:30 |
| 11:00 | 01:30 |
| 12:00 | 02:30 |
| 13:00 | 03:30 |
| 14:00 | 04:30 |
| 15:00 | 05:30 |
| 16:00 | 06:30 |
| 17:00 | 07:30 |
| 18:00 | 08:30 |
| 19:00 | 09:30 |
| 20:00 | 10:30 |
| 21:00 | 11:30 |
| 22:00 | 12:30 |
| 23:00 | 13:30 |
There is no overlap between 09:00–18:00 working days in these two places.
How many hours is IST ahead of AST?
As abbreviations, AST is always 9.5 hours behind of IST: IST is UTC+5:30 and AST is UTC−4. To convert, subtract 9.5 hours.
Does the IST to AST time difference change?
No. Ast is 9.5 hours behind of ist all year, because neither place changes its clocks.
When IST and AST are both at work
- When AST is 9.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 17:00 in IST (07:30 in AST).
Frequently asked questions about IST and AST time
How many hours ahead is AST of IST?
AST (UTC−4) is 9.5 hours behind of IST (UTC+5:30).
Does the time difference between IST and AST change during the year?
No, it stays 9.5 hours behind all year because neither place changes its clocks.