ACST to Puerto Rico time conversion
Puerto Rico is 13 hours 30 minutes behind ACST.
ACST is always UTC+9:30. Right now most places that use ACST are on ACDT (UTC+10:30): Puerto Rico 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 Puerto Rico on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · ACST → Puerto Rico
This table converts each hour in ACST to Puerto Rico on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| ACST | Puerto Rico | 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 Puerto Rico (UTC-4); choosing a date applies the local clock changes.
Conversion formula: Puerto Rico = ACST − 13h30 · ACDT − 14h30.
| ACST | Puerto Rico |
|---|---|
| 6:00 AM ACST | = 4:30 PM Puerto Rico (-1 day) |
| 7:00 AM ACST | = 5:30 PM Puerto Rico (-1 day) |
| 8:00 AM ACST | = 6:30 PM Puerto Rico (-1 day) |
| 9:00 AM ACST | = 7:30 PM Puerto Rico (-1 day) |
| 10:00 AM ACST | = 8:30 PM Puerto Rico (-1 day) |
| 12:00 PM ACST | = 10:30 PM Puerto Rico (-1 day) |
| 3:00 PM ACST | = 1:30 AM Puerto Rico |
| 5:00 PM ACST | = 3:30 AM Puerto Rico |
| 6:00 PM ACST | = 4:30 AM Puerto Rico |
| 8:00 PM ACST | = 6:30 AM Puerto Rico |
Overlapping meeting hours
The 08:00–18:00 working days in ACST and Puerto Rico do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
ACST and Puerto Rico have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | ACST | Puerto Rico |
|---|---|---|
| 2026 | · 03:00 → 02:00 · 02:00 → 03:00 | No clock changes; UTC-4 all year. |
| 2027 | · 03:00 → 02:00 · 02:00 → 03:00 | No clock changes; UTC-4 all year. |
| 2028 | · 03:00 → 02:00 · 02:00 → 03:00 | No clock changes; UTC-4 all year. |
At the start of 2026, Puerto Rico is 14 hours 30 minutes behind ACDT. The difference changes during the following periods.
- From 2026-04-05 02:00 ACST until 2026-10-04 03:00 ACDT, Puerto Rico is 13 hours 30 minutes behind ACST.
- From 2027-04-04 02:00 ACST until 2027-10-03 03:00 ACDT, Puerto Rico is 13 hours 30 minutes behind ACST.
- From 2028-04-02 02:00 ACST until 2028-10-01 03:00 ACDT, Puerto Rico is 13 hours 30 minutes behind ACST.
Frequently asked questions
What time is 9 AM ACST in Puerto Rico?
9:00 AM ACST = 7:30 PM Puerto Rico (-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 Puerto Rico change during the year?
Yes. During 2026–2028: Puerto Rico is 14 hours 30 minutes behind ACST; Puerto Rico 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 Puerto Rico?
Read the Puerto Rico 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 Puerto Rico?
The 08:00–18:00 working days in ACST and Puerto Rico do not overlap.
What is the time difference between ACST and Puerto Rico now?
Right now, Puerto Rico is 13 hours 30 minutes behind ACST. Conversion formula: Puerto Rico = ACST − 13h30 · ACDT − 14h30.