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Date.prototype.setTime() - JavaScript | MDN

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setTime() 方法以一个表示从 1970-1-1 00:00:00 UTC 计时的毫秒数为来为 Date 对象设置时间。

const launchDate = new Date("July 1, 1999, 12:00:00");
const futureDate = new Date();
futureDate.setTime(launchDate.getTime());

console.log(futureDate);
// Expected output: "Thu Jul 01 1999 12:00:00 GMT+0200 (CEST)"

const fiveMinutesInMillis = 5 * 60 * 1000;
futureDate.setTime(futureDate.getTime() + fiveMinutesInMillis);

console.log(futureDate);
// Expected output: "Thu Jul 01 1999 12:05:00 GMT+0200 (CEST)"
// Note: your timezone may vary

dateObj.setTime(timeValue)

timeValue

一个整数，表示从 1970-1-1 00:00:00 UTC 开始计时的毫秒数。

UTC 1970 年 1 月 1 日 00:00:00 与更新日期之间的毫秒数（实际上是自变量的值）。

使用 setTime 方法用来把一个日期时间赋值给另一个 Date 对象。

theBigDay = new Date("July 1, 1999");
sameAsBigDay = new Date();
sameAsBigDay.setTime(theBigDay.getTime());

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