在 JavaScript 中计算昨天的日期

javascript date

2022-08-29 23:30:44

如何在JavaScript中将昨天计算为日期？

答案 1

var date = new Date();

date ; //# => Fri Apr 01 2011 11:14:50 GMT+0200 (CEST)

date.setDate(date.getDate() - 1);

date ; //# => Thu Mar 31 2011 11:14:50 GMT+0200 (CEST)

答案 2

[编辑2020年9月]：包含先前答案的片段，并添加了箭头功能

[2022 年 4 月]：下面是一个用于扩展原型的片段（不污染全局命名空间）Date)

// a (not very efficient) oneliner
let yesterday = new Date(new Date().setDate(new Date().getDate()-1));
console.log(`Yesterday (oneliner)\n${yesterday}`);

// a function call
yesterday = ( function(){this.setDate(this.getDate()-1); return this} )
            .call(new Date);
console.log(`Yesterday (function call)\n${yesterday}`);

// an iife (immediately invoked function expression)
yesterday = function(d){ d.setDate(d.getDate()-1); return d}(new Date);
console.log(`Yesterday (iife)\n${yesterday}`);

// oneliner using es6 arrow function
yesterday = ( d => new Date(d.setDate(d.getDate()-1)) )(new Date);
console.log(`Yesterday (es6 arrow iife)\n${yesterday}`);

// use a method
const getYesterday = (dateOnly = false) => {
  let d = new Date();
  d.setDate(d.getDate() - 1);
  return dateOnly ? new Date(d.toDateString()) : d;
};
console.log(`Yesterday (method)\n${getYesterday()}`);
console.log(`Yesterday (method dateOnly=true)\n${getYesterday(true)}`);

.as-console-wrapper {
    max-height: 100% !important;
}