如何使用 javascript 获取 4 年 5 个月 3 天前的日期

Question

I have 3 input text

1. <input class="form-control" id="year" name="year" type="text">

2. <input class="form-control" id="month" name="month" type="text">

3. <input class="form-control" id="day" name="day" type="text">

I know how to get 4 years ago, or 5 month ago or 3 days ago.. but how to combine three of them?

Answer 1

Here's an approach using the built-in Date object. We create a new Date object representing the current date, and then use the setFullYear() and setMonth() methods to subtract the specified number of years and months, respectively, and then use setDate() method to subtract the specified number of days

 const getPreviousDate = (years, months, days) => { const date = new Date(); date.setFullYear(date.getFullYear() - years); date.setMonth(date.getMonth() - months); date.setDate(date.getDate() - days); return date; }; console.log(getPreviousDate(1, 2, 10));

Answer 2

Basically, you wanted to deduct the year,month and day from current date? If yes, use date-fns.

 var sub = require('date-fns/sub') var date = new Date() var newDate = sub(date, { years: 5, months: 4, days: 2 }))

 <script src="https://cdn.jsdelivr.net/npm/date-fns@2.29.3/index.min.js"></script>

Answer 3

Here is an example of how you can do it:

 function getDays() { const year = document.getElementById('year').value; const month = document.getElementById('month').value; const day = document.getElementById('day').value; console.log(`${year}year ${month}month ${day}day`); }

 <input class="form-control" id="year" name="year" type="text"> <input class="form-control" id="month" name="month" type="text"> <input class="form-control" id="day" name="day" type="text"> <input type="button" onclick="getDays();" value="click" />

Answer 4

I'm not sure what your question is but try this

var year=getElementById('year');
var month=getElementById('month');
var day=getElementById('day');

var date = year+'-'+month+'-'+day;