在 JavaScript 中更改格式日期

Question

I want to change the format in JavaScript, to be Year-month-day I used this code to get 3 months before, but the format that was generated became like this 9/19/2019. This my code:

var d = new Date();
    d.setMonth(d.getMonth() - 3);
    var x = d.toLocaleDateString();
    console.log(x);

Answer 1

You can get Year, Month and Date and use string interpolation like below

 var d = new Date(); d.setMonth(d.getMonth() - 3); var formattedDate = `${d.getFullYear()}-${(d.getMonth() + 1)}-${d.getDate()}`; console.log(formattedDate);

Answer 2

You are using the toLocaleDateString() which will format to the result you received which is expected.

Reference Mozilla's Docs on Date() to get the right function for you there :)

Most instances you are able to just piece it together yourself similar to:

const date = `${date.getYear()}/${date.getMonth()}/${date.getDay()}`;

It's not a nice solution but there are a lot of restrictions with OOTB Date()

Answer 3

为此，您可以使用momentjs ，这是一个轻量级且方便的库：

var d = moment(new Date()).subtract(3, 'months').format('dd-MMM-yyyy);

Answer 4

var x = d.toISOString().substring(0,10);
console.log(x);

//it will give you the format of y-m-d