Puerto Rico to ACST time conversion
ACST is 13 hours 30 minutes ahead of Puerto Rico.
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 Puerto Rico.
Time difference with your location
Puerto Rico is 4 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in Puerto Rico 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 · Puerto Rico → ACST
This table converts each hour in Puerto Rico to ACST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| Puerto Rico | 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 Puerto Rico (UTC-4) and ACST (UTC+9:30); choosing a date applies the local clock changes.
Conversion formula: ACST = Puerto Rico + 13h30 · ACDT = Puerto Rico + 14h30.
| Puerto Rico | ACST |
|---|---|
| 6:00 AM Puerto Rico | = 7:30 PM ACST |
| 7:00 AM Puerto Rico | = 8:30 PM ACST |
| 8:00 AM Puerto Rico | = 9:30 PM ACST |
| 9:00 AM Puerto Rico | = 10:30 PM ACST |
| 10:00 AM Puerto Rico | = 11:30 PM ACST |
| 12:00 PM Puerto Rico | = 1:30 AM ACST (+1 day) |
| 3:00 PM Puerto Rico | = 4:30 AM ACST (+1 day) |
| 5:00 PM Puerto Rico | = 6:30 AM ACST (+1 day) |
| 6:00 PM Puerto Rico | = 7:30 AM ACST (+1 day) |
| 8:00 PM Puerto Rico | = 9:30 AM ACST (+1 day) |
Overlapping meeting hours
The 08:00–18:00 working days in Puerto Rico and ACST do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
Puerto Rico and ACST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | Puerto Rico | ACST |
|---|---|---|
| 2026 | No clock changes; UTC-4 all year. | · 03:00 → 02:00 · 02:00 → 03:00 |
| 2027 | No clock changes; UTC-4 all year. | · 03:00 → 02:00 · 02:00 → 03:00 |
| 2028 | No clock changes; UTC-4 all year. | · 03:00 → 02:00 · 02:00 → 03:00 |
At the start of 2026, ACDT is 14 hours 30 minutes ahead of Puerto Rico. The difference changes during the following periods.
- From 2026-04-04 12:30 Puerto Rico until 2026-10-03 12:30 Puerto Rico, ACST is 13 hours 30 minutes ahead of Puerto Rico.
- From 2027-04-03 12:30 Puerto Rico until 2027-10-02 12:30 Puerto Rico, ACST is 13 hours 30 minutes ahead of Puerto Rico.
- From 2028-04-01 12:30 Puerto Rico until 2028-09-30 12:30 Puerto Rico, ACST is 13 hours 30 minutes ahead of Puerto Rico.
Frequently asked questions
What time is 9 AM Puerto Rico in ACST?
9:00 AM Puerto Rico = 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 Puerto Rico and ACST change during the year?
Yes. During 2026–2028: ACST is 13 hours 30 minutes ahead of Puerto Rico; ACST is 14 hours 30 minutes ahead of Puerto Rico. 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 Puerto Rico and ACST?
The 08:00–18:00 working days in Puerto Rico and ACST do not overlap.
What is the time difference between Puerto Rico and ACST now?
Right now, ACST is 13 hours 30 minutes ahead of Puerto Rico. Conversion formula: ACST = Puerto Rico + 13h30 · ACDT = Puerto Rico + 14h30.