How to compare dates in javascript?

Question

i want to compare two dates. i used this code

function addRow(dateval,bidchekval) {                       
    var val1 = document.getElementById(dateval);            

   var valcheck=document.getElementById(bidchekval).value;
   var val123=document.getElementById(dateval).value;

   if(val123 > valcheck ){
       alert("success");
   }
}

This is the code that i used but when change month then it will break.those two dates get using date picker. date format example:06-12-2013 15:12:15

You're merely comparing 2 strings. And there's not enough information, in which format are those dates? — Fabrício Matté, Jun 04 '13 at 09:27

Mukesh Soni · Answer 1 · 2013-06-04T09:36:38.030

4

if((new Date(val123).getTime()) > (new Date(valcheck).getTime()) ){
       alert("success");
   }

edited Jun 04 '13 at 09:36

answered Jun 04 '13 at 09:30

Mukesh Soni

6,646
3
30
37

1

`.getTime()` is technically faster than `>` `<` comparisons operators that call the `ToPrimitive` algorithm on the Date objects. With `.getTime()`, `==`/`===` comparisons will also work, which do not work when comparing 2 Date objects. – Fabrício Matté Jun 04 '13 at 09:35
Thanks for the info, Fabricio! I did it because i always work with milliseconds when dealing with date/time. – Mukesh Soni Jun 04 '13 at 09:36
Though it is a bit in this case, I believe `.getTime()` is more clear as it shows what actually happens - the comparison happens between the 2 timestamps from those Date objects. (this conversion would be implicit otherwise) – Fabrício Matté Jun 04 '13 at 09:37

score 2 · Answer 2 · answered Jun 04 '13 at 09:30

You cannot compare strings, but you can compare Date objects.

var valcheck=document.getElementById(bidchekval).value;
var val123=document.getElementById(dateval).value;

var check = new Date(valcheck) ;
var check123 = new Date(val123) ;

if (check > check123){
  alwer("Success") ;
}

How to compare dates in javascript?

2 Answers2