How to check if a Month/Year is greater than current Month/Year in Javascript

Question

I want to check if 08/2014 is greater than 02/2014..

How can I do that in Javascript?? Could someone help me please...

Currently I only check for future year. Here is the code snippet.

this.isDateGreaterThanCurrent=function(b){
    return parseInt(b)>parseInt(new Date().getFullYear());
};

Answer 1

Date objects can be compared with each other. So instead of parsing them you can do it as date object itself.

function isDateGreaterThanToday(b) {
    var dS = b.split("/");
    var d1 = new Date(dS[1], (+dS[0] - 1));
    var today = new Date();
    if (d1 > today) {
        return "D is greater";
    } else {
        return "today is greater";
    }
}

console.log(isDateGreaterThanToday("08/2014"))

JSFiddle

Answer 2

With moment.js (which I recommend), then ..

var d1 = moment("08/2014", "MM/YYYY")
var d2 = moment("02/2014", "MM/YYYY")
d1.isBefore(d2) // false
d1.isAfter(d2)  // true

However, this can be done by hand without much effort.

Create a function that took in "MM/YYYY" and returns "YYYY-MM". The result can then be compared with a standard string compare. The major-first component layout is one reason why a format like ISO 8601 is nice - even as a string, it can be easily ordered.

function toPartialIso(str) {
    var m = str.match(/(\d{2})\/(\d{4})/);
    if (m) {
        return m[2] + "-" + m[1]
    }
    throw "bad date!"
}

toPartialIso("08/2014") < toPartialIso("02/2014")  // false
toPartialIso("08/2014") > toPartialIso("02/2014")  // true

Answer 3

construct two date object with

new Date(year, month)  //month start from 0 (ie january is 0)

as,

d1 = new Date(2014, 7)     // 08/2014   (month - 1)
d2 = new Date(2014, 1)     // 02/2014

Now check,

Date.parse(d1) > Date.parse(d2)

Date.parse(), parses a string representation of a date and returns the number of milliseconds since 1 January, 1970, 00:00:00, local time.

Answer 4

You're nearly there ... Using the split method to create an array out of your date

this.isDateGreaterThanCurrent=function(b){

var a = b.split('/');

if(parseInt(a[1])>parseInt(new Date().getFullYear())) return true;
else if (parseInt(a[1]) == parseInt(new Date().getFullYear()) && parseInt(a[0])>parseInt(new Date().getMonth())+1)return true;

else return false;
};

dont forget getMonth returns values from 0 to 11, not from 1 to 12 !