How to get current date without time?

Try this:

function dateToEpoch(thedate) {
    var time = thedate.getTime();
    return time - (time % 86400000);
}

or this:

function dateToEpoch2(thedate) {
   return thedate.setHours(0,0,0,0);
}

Example : http://jsfiddle.net/chns490n/1/

Reference: (Number) Date.prototype.setHours(hour, min, sec, millisec)