var dayByDayChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: <?php echo json_encode($arr_dates); ?>,
            //labels: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31],
            datasets: [{
                label: '<?php echo $thisYear; ?>',
                data: [<?php echo $rev2017; ?>],
                backgroundColor: "rgba(153,255,51,0.6)"
            }, {
                label: '<?php echo $lastYear;?>',
                data: [<?php echo $rev2016; ?>],
                backgroundColor: "rgba(255,153,0,0.6)"
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            scales: {
                xAxes: [{
                    type: 'time',
                    time: {
                        displayFormats: {
                            'millisecond': 'MMM DD',
                            'second': 'MMM DD',
                            'minute': 'MMM DD',
                            'hour': 'MMM DD',
                            'day': 'MMM DD',
                            'week': 'MMM DD',
                            'month': 'MMM DD',
                            'quarter': 'MMM DD',
                            'year': 'MMM DD'
                        }
                    }
                }]
            }
        }

    });

dayByDayChart.data.datasets[0].data = json.this_year;
        dayByDayChart.data.datasets[1].data = json.last_year;
        dayByDayChart.data.labels = json.dates;