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Date.prototype.getDate() - JavaScript | MDN
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Date.prototype.getDate()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
getDate() は Date インスタンスのメソッドで、地方時に基づき、この日付の「日」を返します。
試してみましょう
const birthday = new Date("August 19, 1975 23:15:30");
const date1 = birthday.getDate();
console.log(date1);
// 予想される結果: 19
構文
js
getDate()
引数
なし。
返値
1 から 31 までの間の整数値。地方時に基づき、指定された日時の「日」を表します。日時が無効な場合は NaN を返します。
例
getDate() の使用
以下の 2 行目の文は、Date オブジェクトである xmas95 の値に基づき、変数 day に 25 という値を代入します。
js
const xmas95 = new Date("1995-12-25T23:15:30");
const day = xmas95.getDate();
console.log(day); // 25
仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-date.prototype.getdate |
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