Shanghai time explained
The whole of China runs on a single time zone, eight hours ahead of UTC, despite the country spanning what would naturally be five. There is no daylight saving. In the far west of Xinjiang this means official sunrise can fall after 10:00 in winter, and many residents there keep an unofficial local time two hours behind the clock on the wall.
Shanghai does not observe daylight saving. Its offset from UTC is the same all year round, which makes scheduling with it noticeably simpler.
Reaching Shanghai
A Shanghai afternoon reaches the European morning, but the United States is effectively a next-day conversation — the overlap with New York is only the very early morning or the late evening.
How this page works
The time above is calculated on your own device from the IANA time zone
database that ships with your browser, using the zone
Asia/Shanghai. Nothing is fetched from a server, and the offset
shown is whatever is currently in force rather than a
number typed into the page — so when a country changes its rules, this
page changes with it.
The difference from your own clock is worked out the same way, comparing Shanghai's current offset against your device's. If your computer's clock is wrong, so is that comparison.