目前 GMT 時間

帶當前 Unix 時間戳的即時 GMT 時鐘。GMT 位於 UTC+00:00,在所有實際用途上等同於 UTC。

What is GMT?

GMT (Greenwich Mean Time) is the timezone at zero UTC offset, historically defined by the mean solar time at the Royal Observatory in Greenwich, London. It has been used as the international time standard since 1884 and is the basis for UTC.

When GMT differs from UTC

In strict astronomical terms, GMT can vary from UTC by up to 0.9 seconds because Earth's rotation is not perfectly uniform. UTC corrects for this with occasional leap seconds. In practice, software and networking always use UTC — GMT remains in everyday language and HTTP headers.