app.filter('dateFilter', function () {
    return function (campaigns, year, month) {
        var filtered = [];
        if (!campaigns)
            return null;
        for (var i = 0; i < campaigns.length; i++) {
            var startDate = new Date(campaigns[i].startTime);
            var endDate = new Date(campaigns[i].endTime);

            if ( Validation )
                filtered.push(campaigns[i]);
        }
        return filtered;
    };
});