roboncode

// Requires either "underscore" or "lodash"
function difference(source, compare) {
    var ret = {}, dateStr;
    for (var name in compare) {
        if (name in source) {
            if (_.isDate(compare[name])) {
                dateStr = _.isDate(source[name]) ? source[name].toISOString() : source[name];
                if (compare[name].toISOString() !== dateStr) {
                    ret[name] = compare[name];
                }