Month year comparison in javascript - Stack Overflow

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I have two input fields in which we enter Month-year. And display data in graph representation. Field1:Jan-2016 Field2:Jan-2015

I have to pare and this fields and if Field1>Field2 then alert message has to display.

How to do the parison in java script

Input type format is Month-year

I have two input fields in which we enter Month-year. And display data in graph representation. Field1:Jan-2016 Field2:Jan-2015

I have to pare and this fields and if Field1>Field2 then alert message has to display.

How to do the parison in java script

Input type format is Month-year

• javascript

Share Improve this question Follow asked Apr 3, 2016 at 10:00 user4336860user4336860 4

• Can you share executable demo/snippet or JSFiddle ? – Rayon Commented Apr 3, 2016 at 10:01
• Can pare month using index of months array..And year using Number parison – Rayon Commented Apr 3, 2016 at 10:02
• Possible duplicate of Compare two dates with JavaScript – Maen Commented Apr 3, 2016 at 10:03
• Could you please share the fiddle with example. I couldn't make itthis format. – user4336860 Commented Apr 3, 2016 at 10:04

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6 Answers 6

Sorted by: Reset to default 5

You can use this small sample in your code

var date_1 = new Date('2017', '01');
var date_2 = new Date('2015', '02');

if (date_1.getTime() > date_2.getTime()) {

  /* YOUR CODE */
}

Update: 2016/04/21

With + operator (more laconic):

if (+new Date('2017', '01') > +new Date('2015', '02')) {

  /* YOUR CODE */
}

By using valueOf():

if (new Date('2017', '01').valueOf() > new Date('2015', '02').valueOf()) {

  /* YOUR CODE */
}

You can separate your strings and have a lookup for the month number and return the wanted parison.

function greater(f1, f2) {
    function getDate(f) {
        var d = f.split('-');
        d[0] = { jan: 1, feb: 2, mar: 3, apr: 4, may: 5, jun: 6, jul: 7, aug: 8, sep: 9, oct: 10, nov: 11, dec: 12 }[d[0].toLowerCase()] || 0;
        return d;
    }

    var d1 = getDate(f1),
        d2 = getDate(f2);
    return d1[1] > d2[1] || d1[1] === d2[1] && d1[0] > d2[0];
}

document.write(greater('Jan-2016', 'Jan-2015') + '<br>');
document.write(greater('Feb-2016', 'Jan-2016') + '<br>');
document.write(greater('Feb-2014', 'Jan-2016') + '<br>');

If you have the consistent string format of "YYYY-MM", e.g. "2020-10", "2021-01", you don't even have to convert them to date for accurate parison, just pare the string value directly if you just want to know which month is the later month.

Try this:

var d1 = "2020-12";
var d2 = "2021-01";

var greaterMth = d2 > d1 ? d2 : d1;

alert("Greater month is: " + greaterMth);

But for your case, that will be:

var d1 = new Date("Jan-2016");
var d2 = new Date("Jan-2015");

greaterMth = d2 > d1 ? "Jan-2015" : "Jan-2016";
    
alert("Greater month is: " + greaterMth);

You don't even have to bother about the 1st of the month generated by the new Date().

You can use a JavaScript Date object to pare your dates:

new Date("Jan-2016") > new Date("Jan-2015") //-> true

Ideally you should pare Date objects, but Date can't parse strings of the format you use.

If you format the date as "2015-01" and "2016-01" you can use Javascript's Date objects to pare them.

This gives you the benefit that you can continue to use these as actual date representations in your script, should you need to.

Note: if you format the date as, ex, "201501" and "201601" you can use simple greater-than or less-than parisons instead.

So you need to:

1. Split the date string up into month and year
2. Convert the month string to an integer
3. Make a new variable to contain the formatted date
4. Compare the formatted dates

You can use a JavaScript library moment.js.

To get the date object, use

var date1= moment("Jan-2016","MMM-YYYY");

Similarly do it for second date and then just pare them as date1 > date2.

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