Time until

timeUntil.js

var timeUntil = {
    
    inHours: function(d1, d2) {
        return parseInt((d2.getTime()-d1.getTime())/(24*3600), 10);
    },
 
    inDays: function(d1, d2) {
        return parseInt((d2.getTime()-d1.getTime())/(24*3600*1000), 10);
    },
 
    inWeeks: function(d1, d2) {
        return parseInt((d2.getTime()-d1.getTime())/(24*3600*1000*7), 10);
    },
 
    inMonths: function(d1, d2) {
        return (d2.getMonth()+12*d2.getFullYear())-(d1.getMonth()+12*d1.getFullYear());
    },
 
    inYears: function(d1, d2) {
        return d2.getFullYear()-d1.getFullYear();
    }
}
 
var endDate = new Date("July, 20, 2012");
var startDate = new Date();

console.log(timeUntil.inDays(startDate,endDate));
console.log(timeUntil.inHours(startDate,endDate));
​