United States to ACST time conversion
ACST is 13 hours 30 minutes ahead of United States. After the next clock change (): ACST is 14 hours 30 minutes ahead of United States.
ACST is always UTC+9:30. Right now most places that use ACST are on ACDT (UTC+10:30): ACDT is 14 hours 30 minutes ahead of United States.
Time difference with your location
United States is 4 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in United States to convert it to ACST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · United States → ACST
This table converts each hour in United States to ACST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| United States | ACST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 13:301:30 PM | |
| 01:001:00 AM | 14:302:30 PM | |
| 02:002:00 AM | 15:303:30 PM | |
| 03:003:00 AM | 16:304:30 PM | |
| 04:004:00 AM | 17:305:30 PM | |
| 05:005:00 AM | 18:306:30 PM | |
| 06:006:00 AM | 19:307:30 PM | |
| 07:007:00 AM | 20:308:30 PM | |
| 08:008:00 AM | 21:309:30 PM | |
| 09:009:00 AM | 22:3010:30 PM | |
| 10:0010:00 AM | 23:3011:30 PM | |
| 11:0011:00 AM | 00:3012:30 AM +1 day | |
| 12:0012:00 PM | 01:301:30 AM +1 day | |
| 13:001:00 PM | 02:302:30 AM +1 day | |
| 14:002:00 PM | 03:303:30 AM +1 day | |
| 15:003:00 PM | 04:304:30 AM +1 day | |
| 16:004:00 PM | 05:305:30 AM +1 day | |
| 17:005:00 PM | 06:306:30 AM +1 day | |
| 18:006:00 PM | 07:307:30 AM +1 day | |
| 19:007:00 PM | 08:308:30 AM +1 day | |
| 20:008:00 PM | 09:309:30 AM +1 day | |
| 21:009:00 PM | 10:3010:30 AM +1 day | |
| 22:0010:00 PM | 11:3011:30 AM +1 day | |
| 23:0011:00 PM | 12:3012:30 PM +1 day |
Quick conversion examples
These examples use United States (UTC-4) and ACST (UTC+9:30); choosing a date applies the local clock changes.
Conversion formula: ACST = United States + 13h30 · ACDT = United States + 15h30 · ACDT = United States + 14h30.
| United States | ACST |
|---|---|
| 6:00 AM United States | = 7:30 PM ACST |
| 7:00 AM United States | = 8:30 PM ACST |
| 8:00 AM United States | = 9:30 PM ACST |
| 9:00 AM United States | = 10:30 PM ACST |
| 10:00 AM United States | = 11:30 PM ACST |
| 12:00 PM United States | = 1:30 AM ACST (+1 day) |
| 3:00 PM United States | = 4:30 AM ACST (+1 day) |
| 5:00 PM United States | = 6:30 AM ACST (+1 day) |
| 6:00 PM United States | = 7:30 AM ACST (+1 day) |
| 8:00 PM United States | = 9:30 AM ACST (+1 day) |
Overlapping meeting hours
The 08:00–18:00 working days in United States and ACST do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
United States and ACST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | United States | ACST |
|---|---|---|
| 2026 | · 02:00 → 03:00 · 02:00 → 01:00 | · 03:00 → 02:00 · 02:00 → 03:00 |
| 2027 | · 02:00 → 03:00 · 02:00 → 01:00 | · 03:00 → 02:00 · 02:00 → 03:00 |
| 2028 | · 02:00 → 03:00 · 02:00 → 01:00 | · 03:00 → 02:00 · 02:00 → 03:00 |
At the start of 2026, ACDT is 15 hours 30 minutes ahead of United States. The difference changes during the following periods.
- From 2026-03-08 03:00 United States until 2026-04-04 12:30 United States, ACDT is 14 hours 30 minutes ahead of United States.
- From 2026-04-04 12:30 United States until 2026-10-03 12:30 United States, ACST is 13 hours 30 minutes ahead of United States.
- From 2026-10-03 12:30 United States until 2026-11-01 01:00 United States, ACDT is 14 hours 30 minutes ahead of United States.
- From 2027-03-14 03:00 United States until 2027-04-03 12:30 United States, ACDT is 14 hours 30 minutes ahead of United States.
- From 2027-04-03 12:30 United States until 2027-10-02 12:30 United States, ACST is 13 hours 30 minutes ahead of United States.
- From 2027-10-02 12:30 United States until 2027-11-07 01:00 United States, ACDT is 14 hours 30 minutes ahead of United States.
- From 2028-03-12 03:00 United States until 2028-04-01 12:30 United States, ACDT is 14 hours 30 minutes ahead of United States.
- From 2028-04-01 12:30 United States until 2028-09-30 12:30 United States, ACST is 13 hours 30 minutes ahead of United States.
- From 2028-09-30 12:30 United States until 2028-11-05 01:00 United States, ACDT is 14 hours 30 minutes ahead of United States.
Frequently asked questions
What time is 9 AM United States in ACST?
9:00 AM United States = 10:30 PM ACST, using UTC-4 and UTC+9:30. Choose a date above for the seasonal local time.
Does the time difference between United States and ACST change during the year?
Yes. During 2026–2028: ACST is 13 hours 30 minutes ahead of United States; ACST is 14 hours 30 minutes ahead of United States; ACST is 15 hours 30 minutes ahead of United States. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in ACST?
Read the ACST 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 United States and ACST?
The 08:00–18:00 working days in United States and ACST do not overlap.
What is the time difference between United States and ACST now?
Right now, ACST is 13 hours 30 minutes ahead of United States. Conversion formula: ACST = United States + 13h30 · ACDT = United States + 15h30 · ACDT = United States + 14h30.