ACST to United States time conversion
United States is 13 hours 30 minutes behind ACST. After the next clock change (): United States is 14 hours 30 minutes behind ACST.
ACST is always UTC+9:30. Right now most places that use ACST are on ACDT (UTC+10:30): United States is 14 hours 30 minutes behind ACDT.
Time difference with your location
ACST is 9 hours 30 minutes ahead of UTC. Compare with your local time →
Choose a date and time
Choose the local time in ACST to convert it to United States on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · ACST → United States
This table converts each hour in ACST to United States on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| ACST | United States | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 10:3010:30 AM -1 day | |
| 01:001:00 AM | 11:3011:30 AM -1 day | |
| 02:002:00 AM | 12:3012:30 PM -1 day | |
| 03:003:00 AM | 13:301:30 PM -1 day | |
| 04:004:00 AM | 14:302:30 PM -1 day | |
| 05:005:00 AM | 15:303:30 PM -1 day | |
| 06:006:00 AM | 16:304:30 PM -1 day | |
| 07:007:00 AM | 17:305:30 PM -1 day | |
| 08:008:00 AM | 18:306:30 PM -1 day | |
| 09:009:00 AM | 19:307:30 PM -1 day | |
| 10:0010:00 AM | 20:308:30 PM -1 day | |
| 11:0011:00 AM | 21:309:30 PM -1 day | |
| 12:0012:00 PM | 22:3010:30 PM -1 day | |
| 13:001:00 PM | 23:3011:30 PM -1 day | |
| 14:002:00 PM | 00:3012:30 AM | |
| 15:003:00 PM | 01:301:30 AM | |
| 16:004:00 PM | 02:302:30 AM | |
| 17:005:00 PM | 03:303:30 AM | |
| 18:006:00 PM | 04:304:30 AM | |
| 19:007:00 PM | 05:305:30 AM | |
| 20:008:00 PM | 06:306:30 AM | |
| 21:009:00 PM | 07:307:30 AM | |
| 22:0010:00 PM | 08:308:30 AM | |
| 23:0011:00 PM | 09:309:30 AM |
Quick conversion examples
These examples use ACST (UTC+9:30) and United States (UTC-4); choosing a date applies the local clock changes.
Conversion formula: United States = ACST − 13h30 · ACDT − 15h30 · ACDT − 14h30.
| ACST | United States |
|---|---|
| 6:00 AM ACST | = 4:30 PM United States (-1 day) |
| 7:00 AM ACST | = 5:30 PM United States (-1 day) |
| 8:00 AM ACST | = 6:30 PM United States (-1 day) |
| 9:00 AM ACST | = 7:30 PM United States (-1 day) |
| 10:00 AM ACST | = 8:30 PM United States (-1 day) |
| 12:00 PM ACST | = 10:30 PM United States (-1 day) |
| 3:00 PM ACST | = 1:30 AM United States |
| 5:00 PM ACST | = 3:30 AM United States |
| 6:00 PM ACST | = 4:30 AM United States |
| 8:00 PM ACST | = 6:30 AM United States |
Overlapping meeting hours
The 08:00–18:00 working days in ACST and United States do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
ACST and United States have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | ACST | United States |
|---|---|---|
| 2026 | · 03:00 → 02:00 · 02:00 → 03:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2027 | · 03:00 → 02:00 · 02:00 → 03:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
| 2028 | · 03:00 → 02:00 · 02:00 → 03:00 | · 02:00 → 03:00 · 02:00 → 01:00 |
At the start of 2026, United States is 15 hours 30 minutes behind ACDT. The difference changes during the following periods.
- From 2026-03-08 17:30 ACDT until 2026-04-05 02:00 ACST, United States is 14 hours 30 minutes behind ACDT.
- From 2026-04-05 02:00 ACST until 2026-10-04 03:00 ACDT, United States is 13 hours 30 minutes behind ACST.
- From 2026-10-04 03:00 ACDT until 2026-11-01 16:30 ACDT, United States is 14 hours 30 minutes behind ACDT.
- From 2027-03-14 17:30 ACDT until 2027-04-04 02:00 ACST, United States is 14 hours 30 minutes behind ACDT.
- From 2027-04-04 02:00 ACST until 2027-10-03 03:00 ACDT, United States is 13 hours 30 minutes behind ACST.
- From 2027-10-03 03:00 ACDT until 2027-11-07 16:30 ACDT, United States is 14 hours 30 minutes behind ACDT.
- From 2028-03-12 17:30 ACDT until 2028-04-02 02:00 ACST, United States is 14 hours 30 minutes behind ACDT.
- From 2028-04-02 02:00 ACST until 2028-10-01 03:00 ACDT, United States is 13 hours 30 minutes behind ACST.
- From 2028-10-01 03:00 ACDT until 2028-11-05 16:30 ACDT, United States is 14 hours 30 minutes behind ACDT.
Frequently asked questions
What time is 9 AM ACST in United States?
9:00 AM ACST = 7:30 PM United States (-1 day), using UTC+9:30 and UTC-4. Choose a date above for the seasonal local time.
Does the time difference between ACST and United States change during the year?
Yes. During 2026–2028: United States is 15 hours 30 minutes behind ACST; United States is 14 hours 30 minutes behind ACST; United States is 13 hours 30 minutes behind ACST. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in United States?
Read the United States clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between ACST and United States?
The 08:00–18:00 working days in ACST and United States do not overlap.
What is the time difference between ACST and United States now?
Right now, United States is 13 hours 30 minutes behind ACST. Conversion formula: United States = ACST − 13h30 · ACDT − 15h30 · ACDT − 14h30.