如何获取 YYYY-MM-DD 格式的日期？

Question

Normally if I wanted to get the date I could just do something like

var d = new Date(); console.log(d);

The problem with doing that, is when I run that code, it returns:

Mon Aug 24 2015 4:20:00 GMT-0800 (Pacific Standard Time)

How could I get the Date() method to return a value in a "MM-DD-YYYY" format so it would return something like:

8/24/2015

Or, maybe MM-DD-YYYY H:M

8/24/2016 4:20

Answer 1

Just use the built-in .toISOString() method like so: toISOString().split('T')[0] . Simple, clean and all in a single line.

 var date = (new Date()).toISOString().split('T')[0]; document.getElementById('date').innerHTML = date;

 <div id="date"></div>

Please note that the timezone of the formatted string is UTC rather than local time.

Answer 2

The below code is a way of doing it. If you have a date, pass it to the convertDate() function and it will return a string in the YYYY-MM-DD format:

var todaysDate = new Date();

function convertDate(date) {
  var yyyy = date.getFullYear().toString();
  var mm = (date.getMonth()+1).toString();
  var dd  = date.getDate().toString();

  var mmChars = mm.split('');
  var ddChars = dd.split('');

  return yyyy + '-' + (mmChars[1]?mm:"0"+mmChars[0]) + '-' + (ddChars[1]?dd:"0"+ddChars[0]);
}

console.log(convertDate(todaysDate)); // Returns: 2015-08-25

Answer 3

Yet another way:

 var today = new Date().getFullYear()+'-'+("0"+(new Date().getMonth()+1)).slice(-2)+'-'+("0"+new Date().getDate()).slice(-2) document.getElementById("today").innerHTML = today

 <div id="today">

Answer 4

What you want to achieve can be accomplished with native JavaScript. The object Date has methods that generate exactly the output you wish.
Here are code examples:

var d = new Date();
console.log(d);
>>> Sun Jan 28 2018 08:28:04 GMT+0000 (GMT)
console.log(d.toLocaleDateString());
>>> 1/28/2018
console.log(d.toLocaleString());
>>> 1/28/2018, 8:28:04 AM

There is really no need to reinvent the wheel.

Answer 5

By using moment.js library, you can do it:

var datetime = new Date("2015-09-17 15:00:00"); datetime = moment(datetime).format("YYYY-MM-DD");

Answer 6

function formatdate(userDate){
  var omar= new Date(userDate);
  y  = omar.getFullYear().toString();
  m = omar.getMonth().toString();
  d = omar.getDate().toString();
  omar=y+m+d;
  return omar;
}
console.log(formatDate("12/31/2014"));

Answer 7

var today = new Date();

function formatDate(date) {
 var dd = date.getDate();
        var mm = date.getMonth() + 1; //January is 0!
        var yyyy = date.getFullYear();
        if (dd < 10) {
          dd = '0' + dd;
        }
        if (mm < 10) {
          mm = '0' + mm;
        }
        //return dd + '/' + mm + '/' + yyyy;
             return yyyy + '/' + mm + '/' +dd ;

}

console.log(formatDate(today));

Answer 8

If you are trying to get the 'local-ISO' date string. Try the code below.

function (date) {
    return new Date(+date - date.getTimezoneOffset() * 60 * 1000).toISOString().split(/[TZ]/).slice(0, 2).join(' ');
}

+date Get milliseconds from a date.

Ref: Date.prototype.getTimezoneOffset Have fun with it :)

Answer 9

Here is a simple function I created when once I kept working on a project where I constantly needed to get today, yesterday, and tomorrow's date in this format.

function returnYYYYMMDD(numFromToday = 0){
  let d = new Date();
  d.setDate(d.getDate() + numFromToday);
  const month = d.getMonth() < 9 ? '0' + (d.getMonth() + 1) : d.getMonth() + 1;
  const day = d.getDate() < 10 ? '0' + d.getDate() : d.getDate();
  return `${d.getFullYear()}-${month}-${day}`;
}

console.log(returnYYYYMMDD(-1)); // returns yesterday
console.log(returnYYYYMMDD()); // returns today
console.log(returnYYYYMMDD(1)); // returns tomorrow

Can easily be modified to pass it a date instead, but here you pass a number and it will return that many days from today.

Answer 10

If you're not opposed to adding a small library, Date-Mirror ( NPM or unpkg ) allows you to format an existing date in YYYY-MM-DD into whatever date string format you'd like.

date('n/j/Y', '2020-02-07') // 2/7/2020
date('n/j/Y g:iA', '2020-02-07 4:45PM') // 2/7/2020 4:45PM
date('n/j [until] n/j', '2020-02-07', '2020-02-08') // 2/7 until 2/8

Disclaimer: I developed Date-Mirror.

Answer 11

This will convert a unix timestamp to local date (+ time)

function UnixTimeToLocalDate = function( unix_epoch_time )
{
    var date,
        str;
        
    date = new Date( unix_epoch_time * 1000 );
    
    str = date.getFullYear() + '-' +
          (date.getMonth() + 1 + '').padStart( 2, '0' )  + '-' +
          (date.getDate() + '').padStart( 2, '0' );

    // If you need hh:mm:ss too then

    str += ' ' +
          (date.getHours()   + '').padStart( 2, '0' ) + ':' +
          (date.getMinutes() + '').padStart( 2, '0' ) + ':' +
          (date.getSeconds() + '').padStart( 2, '0' );
          
    return str;
}

Answer 12

If you want a text format that's good for sorting use:

function formatDateYYYYMMDDHHMMSS(date){
  // YYYY-MM-DD HH:MM:SS
  const datePart = date.toISOString().split("T")[0]
  const timePart = date.toLocaleString('en-US', {hour12: false}).split(",")[1]
  return datePart + timePart
}

As prototype:

Date.prototype.toSortString = function(){
  const date = new Date(this.valueOf());
  return date.toISOString().split("T")[0] + 
         date.toLocaleString('en-US', {hour12: false}).split(",")[1]
}

Answer 13

Simple one line elegant solution for fullYear-fullMonth-FullDay as '2000-01-01'

new Date().toLocaleDateString("fr-CA", 
   {year:"numeric", month: "2-digit", day:"2-digit"}
)

Answer 14

 const padTo2Digits = num => { return num.toString().padStart(2, '0') } const formatDate = date => { return [ date.getFullYear(), padTo2Digits(date.getMonth() + 1), padTo2Digits(date.getDate()) ].join('-') } let value = formatDate(new Date()) document.getElementById('dayFormatUS').innerHTML = value const transformDate = date => { const convert = date.split('-').reverse() return convert.join('/') } document.getElementById('dayFormatBR').innerHTML = transformDate(value)

 <div> Format US - <span id='dayFormatUS'></span> </div> <div> Format BR - <span id='dayFormatBR'></span> </div>