Observatory log
Paris and Lang Son, compared
- 01Difference now
Lang Son is 5 hours ahead of Paris.
Paris: CEST (UTC+2) · Lang Son: UTC+7 (UTC+7)
Next changeFrom 25 October 2026: Lang Son is 6 hours ahead of Paris.
- 02Through 2026–2027
- 1 January 2026 – 29 March 2026+6 h
- 29 March 2026 – 25 October 2026+5 h
- 25 October 2026 – 28 March 2027+6 h
- 28 March 2027 – 31 October 2027+5 h
- 31 October 2027 – 31 December 2027+6 h
Difference of Lang Son from Paris. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
- Tue–Fri: 09:00–12:00 in Paris = 14:00–17:00 in Lang Son · 3 h
- Mon: 09:00–11:00 in Paris = 15:00–17:00 in Lang Son · 2 h
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
09:00–12:00 in Paris = 14:00–17:00 in Lang Son
Inside both working days (Tue–Fri).
- 05Weekend
Paris: Saturday and Sunday
Lang Son: Saturday and Sunday
24 hours
A day in Paris, in Lang Son
| Paris | Lang Son | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 05:00 | |
| 01:00 | 06:00 | |
| 02:00 | 07:00 | |
| 03:00 | 08:00 | |
| 04:00 | 09:00 | |
| 05:00 | 10:00 | |
| 06:00 | 11:00 | |
| 07:00 | 12:00 | |
| 08:00 | 13:00 | |
| 09:00 | 14:00 | |
| 10:00 | 15:00 | |
| 11:00 | 16:00 | |
| 12:00 | 17:00 | |
| 13:00 | 18:00 | |
| 14:00 | 19:00 | |
| 15:00 | 20:00 | |
| 16:00 | 21:00 | |
| 17:00 | 22:00 | |
| 18:00 | 23:00 | |
| 19:00 | 00:00Tomorrow | |
| 20:00 | 01:00Tomorrow | |
| 21:00 | 02:00Tomorrow | |
| 22:00 | 03:00Tomorrow | |
| 23:00 | 04:00Tomorrow |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Paris and Lang Son
More time differences with Paris
Questions
Asked about Paris and Lang Son
What is the time difference between Paris and Lang Son?
Lang Son is 5 hours ahead of Paris. This holds until 25 October 2026; then Lang Son is 6 hours ahead of Paris.
What is the best time for a call between Paris and Lang Son?
Inside both working days: Tue–Fri: 09:00–12:00 in Paris = 14:00–17:00 in Lang Son · 3 h.
When does the time difference between Paris and Lang Son change?
In the next 12 months it changes on: 25 October 2026 (+6 h); 28 March 2027 (+5 h).