Javascript date comparison bug?

Question

Why doesn't this work right?

function test() { 
    var start = new Date(2012, 3, 31, 19, 0, 0); // 3/31/2012 7:00 PM
    var end = new Date(2012, 4, 1, 1, 0, 0);     // 4/01/2012 1:00 AM

    if (end < start)
        console.log("oops!");
    else
        console.log("works!");
}

Output:

oops!

Answer 1

Months are 0-based in js

var start = new Date(2012, 2, 31, 19, 0, 0); // 3/31/2012 7:00 PM
var end = new Date(2012, 3, 1, 1, 0, 0);     // 4/01/2012 1:00 AM

In your case both start and end are 1 May 2012. Just output the values and you'll see.