diff --git a/pmcalendar.php b/pmcalendar.php
index 6c3644a..14410f6 100644
--- a/pmcalendar.php
+++ b/pmcalendar.php
@@ -1980,6 +1980,14 @@ if ($act == 'newevent') {
                         dataset: {
                             source: chartsdata
                         },
+                        dataZoom: [
+                            {
+                                id: 'dataZoomX',
+                                type: 'slider',
+                                xAxisIndex: [0],
+                                filterMode: 'filter'
+                            }
+                        ],
                         xAxis: {
                             type: 'category',
                             axisLabel:{