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How do I compare dates in javascript with two different formats?

function mainFunc() {
    dueDate = "30/12/2014";
    var firstReminderDate = dueDate;
    var today = new Date();
    var firstDate = convertToDate(firstReminderDate);
    if (today > firstDate) {
        //send reminder to A
    } else {
        // send reminder to B
    }
}

function convertToDate(dateString) {
    var dateData = dateString.split("/");
    var date = new Date(new Date().setFullYear(dateData[0], dateData[1] - 1, dateData[2]));
    return new Date(date);
}

I need to compare two dates, not times, and how do I remove the time part and just compare the dates? ConvertToDate () returns "Thu Jan 01 05:30:00 GMT + 05: 30 1970" every time?

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4 answers


You can simplify your code. To get the date from dd/mm/yyyy

by simply dividing by /

, changing the result and appending it to '/', you get yyyy/mm/dd

which is valid input for the new one Date

to compare with another Date

, See snippet



var report = document.querySelector('#result');
report.innerHTML += '30/12/2014 => '+ mainFunc('30/12/2014');
report.innerHTML += '<br>01/12/2014 => '+ mainFunc('01/01/2014');

function mainFunc(due) {
    due = due ? convertToDate(due) : new Date;
    return new Date > due 
           ? due +' passed: <b>send reminder to A</b>'
           : due +' not passed: <b>send reminder to B</b>';
}

function convertToDate(dateString) {
    return new Date(dateString.split("/").reverse().join('/'));
}
      

        
        
        
      

    
<div id="result"></div>
Run code


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Just return it in milliseconds

function convertToDate(dateString) {
    var dateData = dateString.split("/");
    return +new Date(new Date().setFullYear(dateData[0], dateData[1] - 1, dateData[2]));
}


And also change var today = new Date();

to var today = +new Date();

. This should work now. +

here converts the object Date

to milliseconds.

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The best way to compare two dates is to instantiate them with the same object, here you must use a Date object.

function mainFunc(){
    var firstDate = new Date( dueDate = "30/12/2014" );
    today = new Date(); 

    if( today > firstDate ){
     //...
    }
    else{
     //...
    }
}
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I recommend momentjs lib to parse, validate, manipulate and display dates in JavaScript.

var firstDate = moment("30/12/2014", "DD/MM/YYYY")
var today = moment();

// Format to Unix Timestamp to compare
if(today.format('X') > firstDate.format('X')){

  //send reminder to A
}else{

  // send reminder to B
}

Here is the link http://momentjs.com/

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