今回は Node.js で Date 型を扱いやすくする date-utils の使い方をご紹介します。
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環境
- Node.js v8.11.3
- npm v5.6.0
使用するライブラリはこちら
→ JerrySievert/date-utils
date-utils の使い方
インストール
npm を使ってインストールを行っていきます。
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| $ npm install date-utils |
by app.js 内での使い方
import か require を行うことで、Date 型が拡張されるようになります。
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| require('date-utils'); |
日付フォーマット変更（.toFormat）
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| let nowFormatted = new Date().toFormat("YYYY年MM月DD日 HH24時MI分SS秒"); | |
| // return 2018年08月30日 15時51分14秒 | |
| console.log(nowFormatted); |
本日の日付を取得（.today）
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| let today = Date.today(); | |
| console.log(today); |
昨日の日付を取得（.yesterday）
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| let yesterday = Date.yesterday(); | |
| console.log(yesterday); |
明日の日付を取得（.tomorrow）
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| let tomorrow = Date.tomorrow(); | |
| console.log(tomorrow); |
日付を比較（.compare）
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| let today = Date.today(); | |
| let tomorrow = Date.tomorrow(); | |
| let yesterday = Date.yesterday(); | |
| // return 0 | |
| let compareTodayToday = Date.compare(today, today); | |
| console.log(compareTodayToday); | |
| // return -1 | |
| let compareTodayTomorrow = Date.compare(today, tomorrow); | |
| console.log(compareTodayTomorrow); | |
| // return 1 | |
| let compareTomorrowToday = Date.compare(tomorrow, today); | |
| console.log(compareTomorrowToday); |
日付を比較（.equals）
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| let today = Date.today(); | |
| let tomorrow = Date.tomorrow(); | |
| let yesterday = Date.yesterday(); | |
| // return true | |
| console.log(Date.equals(today, today)); | |
| // return false | |
| console.log(Date.equals(today, tomorrow)); |
指定年月の日数を取得（.getDaysInMonth）
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| // return 31 | |
| console.log(Date.getDaysInMonth(2018, 8 + 1)); |
日付の形式チェック（.validateDay）
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| // return true | |
| console.log(Date.validateDay(31, 2018, 8 + 1)); | |
| // return false | |
| console.log(Date.validateDay(32, 2018, 8 + 1)); |
今日よりも後かチェック（.isAfter）
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| let yesterday = Date.yesterday(); | |
| let tomorrow = Date.tomorrow(); | |
| // return true | |
| console.log(tomorrow.isAfter()); | |
| // return false | |
| console.log(yesterday.isAfter()); |
今日よりも前かチェック（.isBefore）
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| let yesterday = Date.yesterday(); | |
| let tomorrow = Date.tomorrow(); | |
| // return true | |
| console.log(yesterday.isBefore()); | |
| // return false | |
| console.log(tomorrow.isBefore()); |
日付加算（.add）
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| let today = Date.today(); | |
| // milliseconds OR seconds OR minutes OR hours OR days OR weeks OR months OR years | |
| console.log(today..add({"months": 2, "days": 1})); |
日付減算（.remove）
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| let today = Date.today(); | |
| // milliseconds OR seconds OR minutes OR hours OR days OR weeks OR months OR years | |
| console.log(today.remove({"months": 2, "days": 1})); |
色々と調べてやってみましたが、残念がら結局 moment.js が一番使いやすいような気がしました…笑
次は moment.js の使い方についてご紹介しようと思います。
→ moment.js の使い方についてもまとめてみました
