解析并格式化javascript日期：dd M YYYY到YYYY-mm-dd

Question

I have a date which looks like:

30 Apr 2015

How do I parse and display the date like this (without Moment.js)?

2015-04-31 (or YYYY-mm-dd)

Answer 1

The easiest thing to do might be to use moment.js .

If you prefer rolling your own solution in vanilla JS, this will work:

var padZero = function (integer) { 
    return integer < 10 ? '0' + integer : '' + integer 
};

var myDate = new Date('30 Apr 2015');
var myDateString = myDate.getFullYear() + '-' + 
    (padZero(myDate.getMonth()+1)) + '-' + 
    (padZero(myDate.getDate()));

console.log(myDateString); // 2015-04-30

Answer 2

The parsing part is easy...though it'll fail on your example, because there is no 31st day in April :)

var x = new Date("30 Apr 2015");

Formatting the date is a little trickier. You have a few options. Date natively supports several output methods ( .toDateString() , .toLocaleDateString() , etc) but none of them match the format you've given. It does, however, allow you to individually select the day, month and year values for the date. So, you can assemble them manually:

console.log(x.getFullYear() + '-' + (x.getMonth()+1) + '-' + x.getDate())

Note here that .getMonth() returns a 0-based index and isn't padded to two digits, and .getDay() gets the day-of-the-week index, not day-of-the-month (which is .getDate() ).

However, your better choice is to take a look at moment.js , which provides the ability to format by an arbitrary format string, similar to what you'd expect from other languages. Unless you're unable to introduce another library for some reason, I feel this is a category of problem where it makes sense to use the very nice solution that already exists.

Answer 3

Use moment.js

Convert your date like this:

var myDate = moment("30 Apr 15", "DD MMM YY").format("YYYY-MM-DD");
console.log(myDate);
//2015-04-30

DEMO

Answer 4

you can do that easy with

//define Date
    var xdate = "31 Apr 2015";
// simple array to define months from Jan to Dec [01 : 12]
    var months = {
    Jan:'01',
    Feb:'02',
    Mar:'03',
    Apr:'04',
    May:'05'
    };
// split our Date and rearrange as yyyy-mm-dd
    var reform = xdate.split(' ')[2]+'-'+months.Apr+'-'+xdate.split(' ')[0];
    alert(reform);// return 2015-04-31