Observatory log
Singapore and Tulsa, compared
- 01Difference now
Tulsa is 13 hours behind Singapore.
Singapore: UTC+8 (UTC+8) · Tulsa: CDT (UTC−5)
Next changeFrom 1 November 2026: Tulsa is 14 hours behind Singapore.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026−14 h
- 8 March 2026 – 1 November 2026−13 h
- 1 November 2026 – 14 March 2027−14 h
- 14 March 2027 – 7 November 2027−13 h
- 7 November 2027 – 31 December 2027−14 h
Difference of Tulsa 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
09:00–11:00 in Singapore = 20:00–22:00 in Tulsa
No shared office hours: this is early or late for one side (Tue–Fri).
- 05Weekend
Singapore: Saturday and Sunday
Tulsa: Saturday and Sunday
24 hours
A day in Singapore, in Tulsa
| Singapore | Tulsa | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 11:00Yesterday | |
| 01:00 | 12:00Yesterday | |
| 02:00 | 13:00Yesterday | |
| 03:00 | 14:00Yesterday | |
| 04:00 | 15:00Yesterday | |
| 05:00 | 16:00Yesterday | |
| 06:00 | 17:00Yesterday | |
| 07:00 | 18:00Yesterday | |
| 08:00 | 19:00Yesterday | |
| 09:00 | 20:00Yesterday | |
| 10:00 | 21:00Yesterday | |
| 11:00 | 22:00Yesterday | |
| 12:00 | 23:00Yesterday | |
| 13:00 | 00:00 | |
| 14:00 | 01:00 | |
| 15:00 | 02:00 | |
| 16:00 | 03:00 | |
| 17:00 | 04:00 | |
| 18:00 | 05:00 | |
| 19:00 | 06:00 | |
| 20:00 | 07:00 | |
| 21:00 | 08:00 | |
| 22:00 | 09:00 | |
| 23:00 | 10:00 |
Working hoursEarly or eveningNightWeekend
Questions
Asked about Singapore and Tulsa
What is the time difference between Singapore and Tulsa?
Tulsa is 13 hours behind Singapore. This holds until 1 November 2026; then Tulsa is 14 hours behind Singapore.
What is the best time for a call between Singapore and Tulsa?
No shared office hours. The least awkward windows, early or late for one side: Tue–Fri: 09:00–11:00 in Singapore = 20:00–22:00 in Tulsa (yesterday) · 2 h.
When does the time difference between Singapore and Tulsa change?
In the next 12 months it changes on: 1 November 2026 (−14 h); 14 March 2027 (−13 h).