Thanks George, actually < and > works really well for comparing dates. But it seems there’s no formatter to compare two dates to be equal.
However, your comment gave me some direction and I was able to make a custom formatter for that using: Creating Custom Formatters (PHP and client-side) post and use the custom formatter in the data view filter to achieve the result 
dmx.Formatter('string', 'isSameDate', function (val, other_date) {
return moment(val).isSame(other_date, 'day')
});