Date.prototype.setTime()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
setTime() 方法將從 1970 年 01 月 01 日 00:00:00 UTC 起所經過的毫秒數設置為 Date 物件的值。
嘗試一下
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
語法
js
setTime(timeValue)
參數
timeValue-
一個整數，表示自 1970 年 01 月 01 日 00:00:00 UTC 起所經過的毫秒數。
返回值
1970 年 01 月 01 日 00:00:00 UTC 與更新日期之間的毫秒數（實際上是參數值）。
描述
以 setTime() 方法指派一日期與時間至另一 Date 物件。
範例
使用 setTime()
js
const theBigDay = new Date("July 1, 1999");
const sameAsBigDay = new Date();
sameAsBigDay.setTime(theBigDay.getTime());
規範
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-date.prototype.settime |