1. Define local working hours
Do not assume every participant works 09:00–17:00 or Monday–Friday. Set real availability first.
The best international meeting time is not one universal hour. It is the window that preserves working hours for the most participants, makes DST changes visible and rotates unavoidable inconvenience.
| Pair | January overlap | July overlap |
|---|---|---|
| Cairo–London | 6 h | 6 h |
| Cairo–Dubai | 6 h | 7 h |
| Riyadh–London | 5 h | 6 h |
| London–New York | 3 h | 3 h |
| London–Singapore | 0 h | 1 h |
| Dubai–Singapore | 4 h | 4 h |
Do not assume every participant works 09:00–17:00 or Monday–Friday. Set real availability first.
Future meetings must use named city zones so daylight-saving rules apply to that date.
When no shared window exists, rotate early and late calls rather than repeatedly disadvantaging one region.