IST to ACST Converter
ACST is 4 hours ahead of IST.
IST
Thursday, October 22, 2026
India Standard Time · UTC+5:30
ACST
Thursday, October 22, 2026
Australian Central Standard Time · UTC+9:30
Convert IST to ACST
IST 17:38 = ACST 21:38
IST to ACST time chart, hour by hour
| IST | ACST |
|---|
| 00:00 | 04:00 |
| 01:00 | 05:00 |
| 02:00 | 06:00 |
| 03:00 | 07:00 |
| 04:00 | 08:00 |
| 05:00 | 09:00 |
| 06:00 | 10:00 |
| 07:00 | 11:00 |
| 08:00 | 12:00 |
| 09:00 | 13:00 |
| 10:00 | 14:00 |
| 11:00 | 15:00 |
| 12:00 | 16:00 |
| 13:00 | 17:00 |
| 14:00 | 18:00 |
| 15:00 | 19:00 |
| 16:00 | 20:00 |
| 17:00 | 21:00 |
| 18:00 | 22:00 |
| 19:00 | 23:00 |
| 20:00 | 00:00 +1 day |
| 21:00 | 01:00 +1 day |
| 22:00 | 02:00 +1 day |
| 23:00 | 03:00 +1 day |
Highlighted rows fall within 09:00–18:00 in both places: 5 shared working hours.
How many hours is IST behind ACST?
As abbreviations, ACST is always 4 hours ahead of IST: IST is UTC+5:30 and ACST is UTC+9:30. To convert, add 4 hours.
Does the IST to ACST time difference change?
No. Acst is 4 hours ahead of ist all year, because neither place changes its clocks.
Calling hours for IST and ACST
- When ACST is 4 hours ahead of IST: 4 shared office hours, 09:00 to 13:00 in IST (13:00 to 17:00 in ACST).
Frequently asked questions about IST and ACST time
How many hours ahead is ACST of IST?
ACST (UTC+9:30) is 4 hours ahead of IST (UTC+5:30).
Does the time difference between IST and ACST change during the year?
No, it stays 4 hours ahead all year because neither place changes its clocks.