aggregate_hour:
    "function(doc) {
        d = new Date(doc.date* 1000);
        return {date:  (Date.parse((d.getMonth() + 1) + '/' + d.getDate() + '/' + d.getFullYear() + ' ' + d.getHours() + ':00:00') / 1000).toFixed(0)};
     }"

aggregate_day:
    "function(doc) {
        d = new Date(doc.date* 1000);
        return {date:   (Date.parse((d.getMonth() + 1) + '/' + d.getDate() + '/' + d.getFullYear() + ' 00::00') / 1000).toFixed(0)};
     }"

aggregate_month:
    "function(doc) {
    d = new Date(doc.date* 1000);
    return {date:   (Date.parse((d.getMonth() + 1) + '/1/' + d.getFullYear()) / 1000).toFixed(0)};
    }"