Home / Converters / IST → AST
IST to AST
Convert IST (India Standard Time, UTC+05:30) to AST (Atlantic Standard Time, UTC−04:00). AST is 9 hours 30 minutes behind IST.
IST
—
India Standard Time
→
AST
—
Atlantic Standard Time
Convert a specific time
=
—
IST to AST conversion chart (24-hour)
| IST | AST |
|---|---|
| 00:00 | 14:30 −1d |
| 01:00 | 15:30 −1d |
| 02:00 | 16:30 −1d |
| 03:00 | 17:30 −1d |
| 04:00 | 18:30 −1d |
| 05:00 | 19:30 −1d |
| 06:00 | 20:30 −1d |
| 07:00 | 21:30 −1d |
| 08:00 | 22:30 −1d |
| 09:00 | 23:30 −1d |
| 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 |
IST to AST time conversion
The difference between IST and AST is fixed: AST is 9 hours 30 minutes behind IST. For example, 9:00 AM (09:00) IST is 23:30 AST, and 6:00 PM (18:00) IST is 08:30 AST. The chart above lists the conversion for every hour of the day.
These conversions use each zone's standard UTC offset — UTC+05:30 for IST (India Standard Time) and UTC−04:00 for AST (Atlantic Standard Time) — so the result is exact and does not shift with Daylight Saving Time. To convert a real calendar date between cities with automatic DST handling, use the full time zone converter.