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Day.jsで誕生日から年齢を計算する

JavaScript

Posted at 2021-11-24

環境

Day.js 1.8.16

コード

いろいろとやり方はあるが、diff を使うのが一番シンプル。

// input data
const birthday = {
  year: 1995,
  month: 12,
  date: 6,
};

const today = dayjs();
const { year, month, date } = birthday;
const dayjsBirthday = dayjs(`${year}-${month}-${date}`);

console.log(today.diff(dayjsBirthday, 'year'));

CodePen: https://codepen.io/ezawa800/pen/VwzJmmM

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