Question

我在今天日期之前12天计算。但它没有返回正确的日期。例如，对于今天的数据，11/11/2013（mm / dd / yyyy），当它应该返回10/31/2013时，它将返回2013年10月30日。

这是代码

var d = new Date();
d.setDate(d.getDate() - 12);
d.setMonth(d.getMonth() + 1 - 0);
var curr_date = d.getDate();
var curr_month = d.getMonth();
var curr_year = d.getFullYear();
if (curr_month < 10 && curr_date < 10) {
    var parsedDate = "0" + curr_month + "/" + "0" + curr_date + "/" + curr_year;
    alert(parsedDate);
} else if (curr_month < 10 && curr_date > 9) {
    var parsedDate = "0" + curr_month + "/" + curr_date + "/" + curr_year;
    alert(parsedDate);
} else if (curr_month > 9 && curr_date < 10) {
    var parsedDate = curr_month + "/" + "0" + curr_date + "/" + curr_year;
    alert(parsedDate);
} else {
    var parsedDate = curr_month + "/" + curr_date + "/" + curr_year;
    alert(parsedDate);
}

Answer 1

问题解决了

var days; // Days you want to subtract
var date = new Date();
var last = new Date(date.getTime() - (days * 24 * 60 * 60 * 1000));
var day =last.getDate();
var month=last.getMonth()+1;
var year=last.getFullYear();

Answer 2

试图减去天数很棘手。最好从时间戳中减去并更改日期。

要减去12天，请执行：

   var d = new Date();
   var ts = d.getTime();
   var twelveDays = ts - (12 * 24 * 60 * 60 * 1000);
   d.setUTCDate(twelveDays);

Answer 3

您可以使用以下代码获取从今天到之前7天的日期

var date = new Date();
date.setDate(date.getDate() - 7);

var finalDate = date.getDate()+'/'+ (date.getMonth()+1) +'/'+date.getFullYear();

Answer 4

binary(0, length)

新日期-从计算的毫秒时间创建日期对象。

Date.now（）-给出从1970年开始的时间，以毫秒为单位。

7 * 24 * 60 * 60 * 1000-7天（以毫秒为单位）。

Answer 5

要获取过去的日期，请使用此代码

查看控制台以获取结果

const GetDays = (d,Mention_today=false)=>{
//Mention today mean the array will have today date 
var DateArray = [];
var days=d;
for(var i=0;i<days;i++){
if(!Mention_today && i==0){i=1;days+=1}
var date = new Date();
var last = new Date(date.getTime() - (i * 24 * 60 * 60 * 1000));
var day =last.getDate();
var month=last.getMonth()+1;
var year=last.getFullYear();
const fulld = (Number(year)+'-'+Number(month)+'-'+Number(day)) // Format date as you like
DateArray.push(fulld);
}
return DateArray;
}

console.log(GetDays(5)) //Will get the past 5 days formated YY-mm-dd

Answer 6

Date.prototype.addDays = function(days) {
    // Add days to given date
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + days);
    return date;
}

let today = new Date()

console.log(today.addDays(-7))

Answer 7

首先：获取当前日期

 const startingDate = new Date();

第二：获取你想要的日期 !!：如果直接使用setDate改变startingDate，会改变这个变量。

const sevenDaysBeforeDate = new Date(new Date().setDate(new Date().getDate() - 7));

7 天后

const endDate = new Date(new Date().setDate(new Date().getDate() + 7));

Answer 8

这是一个根据以下内容返回过去或将来的日期的函数；

If plusMinus = -1 then Past Date
If plusMinus = 1 then Future Date

function getDate(inDays, plusMinus) {
    const today = new Date(); 
    return new Date(today.getFullYear(),
                    today.getMonth(),
                    today.getDate() + (inDays * plusMinus));
}

Answer 9

已更新：）

var timeFrom = (X) => {
    var dates = [];
    for (let I = 0; I < Math.abs(X); I++) {
        dates.push(new Date(new Date().getTime() - ((X >= 0 ? I : (I - I - I)) * 24 * 60 * 60 * 1000)).toLocaleString());
    }
    return dates;
}
console.log(timeFrom(-7)); // Future 7 Days
console.log(timeFrom(7)); // Past 7 Days

输出

[
  '7/26/2019, 3:08:15 PM',
  '7/27/2019, 3:08:15 PM',
  '7/28/2019, 3:08:15 PM',
  '7/29/2019, 3:08:15 PM',
  '7/30/2019, 3:08:15 PM',
  '7/31/2019, 3:08:15 PM',
  '8/1/2019, 3:08:15 PM'
]
[
  '7/26/2019, 3:08:15 PM',
  '7/25/2019, 3:08:15 PM',
  '7/24/2019, 3:08:15 PM',
  '7/23/2019, 3:08:15 PM',
  '7/22/2019, 3:08:15 PM',
  '7/21/2019, 3:08:15 PM',
  '7/20/2019, 3:08:15 PM'
]

Answer 10

使用dayjs库，我们可以更轻松地完成

。

import dayjs from 'dayjs';

const getDate = (prevDays) => {
    const now = dayjs();
    console.log(now.subtract(prevDays, 'day').format('mm-dd-yyyy'));
    return now.subtract(prevDays, 'day').toDate();
}

Answer 11

这是最好的解决方案..当X是您的日子：

var dates = [];
for (let i = 0; i < X; i++) {
  var date = new Date();

  var thatDay = date.getDate() - i; //Current Date
  date.setDate(thatDay);
  let day = date.getDate();
  let month = date.getMonth() + 1;
  let year = date
    .getFullYear()
    .toString()
    .substr(-2);

  dates.push(month + '/' + day + '/' + year); //format it as you need
}
//output mm/d/yy

Answer 12

感谢您的帮助。我只是用了一个简单的函数，效果很好

const subtractDayFromDate = (date, days) => {
  const newDate = new Date(date);
  newDate.setDate(newDate.getDate() - days);
  return newDate;
};

JavaScript计算日期从今天到7天

12 个答案: