当前 UTC 时间

带当前 Unix 时间戳(秒)的实时 UTC 时钟。UTC 相对自身没有偏移,且不受夏令时影响。

What is UTC?

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It has an offset of +00:00 and never observes daylight saving time. All other timezones are defined as a positive or negative offset from UTC.

UTC vs GMT

UTC and GMT (Greenwich Mean Time) display the same time for everyday purposes. The difference is technical: GMT is based on Earth's mean solar rotation, while UTC is maintained by atomic clocks. In programming, UTC is the correct term — JavaScript's toUTCString() and HTTP Date headers both output UTC even though they say 'GMT'.