Observatory log
Singapore and Arecibo, compared
- 01Difference now
Arecibo is 12 hours behind Singapore.
Singapore: UTC+8 (UTC+8) · Arecibo: AST (UTC−4)
- 02Through 2026–2027
The difference stays the same all year.
- 1 January 2026 – 31 December 2027−12 h
Difference of Arecibo from Singapore. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
Their working days never overlap.
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
21:00–22:00 in Singapore = 09:00–10:00 in Arecibo
No shared office hours: this is early or late for one side (Mon–Fri).
Also possible: Tue–Fri: 09:00–10:00 in Singapore = 21:00–22:00 in Arecibo (yesterday) · 1 h.
- 05Weekend
Singapore: Saturday and Sunday
Arecibo: Saturday and Sunday
24 hours
A day in Singapore, in Arecibo
| Singapore | Arecibo | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 12:00Yesterday | |
| 01:00 | 13:00Yesterday | |
| 02:00 | 14:00Yesterday | |
| 03:00 | 15:00Yesterday | |
| 04:00 | 16:00Yesterday | |
| 05:00 | 17:00Yesterday | |
| 06:00 | 18:00Yesterday | |
| 07:00 | 19:00Yesterday | |
| 08:00 | 20:00Yesterday | |
| 09:00 | 21:00Yesterday | |
| 10:00 | 22:00Yesterday | |
| 11:00 | 23:00Yesterday | |
| 12:00 | 00:00 | |
| 13:00 | 01:00 | |
| 14:00 | 02:00 | |
| 15:00 | 03:00 | |
| 16:00 | 04:00 | |
| 17:00 | 05:00 | |
| 18:00 | 06:00 | |
| 19:00 | 07:00 | |
| 20:00 | 08:00 | |
| 21:00 | 09:00 | |
| 22:00 | 10:00 | |
| 23:00 | 11:00 |
Working hoursEarly or eveningNightWeekend
Questions
Asked about Singapore and Arecibo
What is the time difference between Singapore and Arecibo?
Arecibo is 12 hours behind Singapore. The difference stays the same all year.
What is the best time for a call between Singapore and Arecibo?
No shared office hours. The least awkward windows, early or late for one side: Mon–Fri: 21:00–22:00 in Singapore = 09:00–10:00 in Arecibo · 1 h; Tue–Fri: 09:00–10:00 in Singapore = 21:00–22:00 in Arecibo (yesterday) · 1 h.
When does the time difference between Singapore and Arecibo change?
It does not change in the next 12 months: Singapore and Arecibo either keep the same time all year or change their clocks on the same dates.