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【JavaScript】現在時刻を取得する

Last updated at Posted at 2022-01-13

割と使うけど忘れやすいので、JavaScriptで現在時刻を取得する方法を備忘録としてメモしておく。

sample.js
const date = new Date(); //現在時刻を取得
const y = date.getFullYear(), //西暦年
      m = date.getMonth() + 1, //月 
      d = date.getDate(), //日
      H = date.getHours(), //時
      M = date.getMinutes(), //分
      S = date.getSeconds(); //秒

console.log(y,m,d,H,M,S); //例 2022 1 14 3 10 30

他にもミリ秒を取得するなどもある。

あとは使う形式に応じて色々と整形する。

sample.js
`${y}/${m}/${d}`; //例 2022/1/14
`${H}:${M}:${S}`; //例 3:10:30

0paddingなどと組み合わせると 2022/01/14 03:10:30などの表記もできる。

sample.js
const m_pad = ( '00' + m ).slice( -2 ); //'00'とsliceの中身は桁数に応じて増減させる。今は2桁表示にさせたいので0は二つ、sliceの中は-2。
console.log(m_pad); //例 01
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