London到Shanghai时差

Working across London and Shanghai

The offset between London and Shanghaiis not a fixed number. Both cities may observe daylight saving time on different dates — or one may stay on standard time year-round — which means the gap can shift by an hour twice a year. If you are scheduling a recurring meeting, always store it as a local time in one city and let the other city's calendar convert automatically, rather than hard-coding a UTC offset that will drift the next time clocks change.

When preparing a meeting invite, be explicit about which city's clock you mean. “3:00 PM” in a calendar invite with no timezone is ambiguous; “3:00 PM Londontime” is clear and leaves no room for error. Most calendar apps will show the meeting in the recipient's local timezone automatically, but email-based invites and chat messages often lose this metadata, so the verbal convention matters.

How this converter stays accurate

The offset you see here is computed from the current IANA timezone database, which tracks historical and scheduled DST rule changes for every region worldwide. When a country shifts or cancels DST — as several have done in recent years — the underlying data updates and the conversion follows, without any manual adjustment on your part. The live widget above the fold uses your browser's built-in timezone engine, so it reflects the rules in effect right now.

The “best meeting time” suggestion overlaps the standard 09:00–17:00 business day in both cities. If your team uses different working hours — a common reality for engineering teams with flex schedules — treat the suggestion as a starting point rather than a hard constraint. Some teams pick a smaller “overlap block” of just two or three hours for synchronous work and reserve the rest of the day for independent focus, which often works better than trying to match a full workday when the offset is large.