Best overlap: 8:00 AM to 11:00 AM in London is 3:00 PM to 6:00 PM in Shanghai.
For the smoothest call, aim inside 8:00 AM to 11:00 AM in London, i.e. 3:00 PM to 6:00 PM in Shanghai. Since Shanghai is 7 hours ahead of London, the workdays overlap by around 3 hours; 8:00 AM in London (3:00 PM in Shanghai) makes a reliable recurring slot. Daylight saving complicates things slightly: London observes it, Shanghai doesn't, so the difference flexes by an hour part of the year.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
London Europe/London | ||||||||||||||||||||||||
Shanghai Asia/Shanghai |
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