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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Date/setUTCDate below:

Date.prototype.setUTCDate() - JavaScript | MDN

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setUTCDate() 方法就是根据全球时间设置特定 date 对象的日期。

const event = new Date("August 19, 1975 23:15:30 GMT-3:00");

console.log(event.getUTCDate());
// Expected output: 20

event.setUTCDate(19);

console.log(event.getUTCDate());
// Expected output: 19

dateObj.setUTCDate(dayValue)

dayValue

一个 1-31 的整形数字，用来指定日期。

如果你指定的参数超出了范围，setUTCDate() 会尝试更新对应的Date 中的日期信息。例如，如果你使用了 40 来作为参数，但是Date 中存储的月份为 6 月，那么日期将被改写为 10 且月份被增到 7 月。

var theBigDay = new Date();
theBigDay.setUTCDate(20);

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