diff --git a/app/js/mdot.js b/app/js/mdot.js
index b292512..4690004 100644
--- a/app/js/mdot.js
+++ b/app/js/mdot.js
@@ -273,9 +273,19 @@ var self = this;
 
           var chartData = [];
 
+      var temporal = {high:0, low:0};
+
           _(this.collection.models).each(function(i) {
+            var dt = i.get('dt');
+            if (temporal.low === 0 || dt < temporal.low) {
+                        temporal.low = dt;
+            }
+            if (temporal.high === 0 || dt > temporal.high) {
+                        temporal.high = dt;
+            }
+
                 chartData.push({
-                            date: i.get('dt'),
+                            date: dt,
                             value: i.get(getMode)
                           });
 
@@ -349,8 +359,8 @@ var self = this;
                       // first trend line
                       var trendLine = new AmCharts.TrendLine();
                       // note,when creating date objects 0 month is January, as months are zero based in JavaScript.
-                      trendLine.initialDate = new Date(2016, 7, 8, 12); // 12 is hour - to start trend line in the middle of the day
-                      trendLine.finalDate = new Date(2012, 7, 15, 12);
+                      trendLine.initialDate = temporal.low; // 12 is hour - to start trend line in the middle of the day
+                      trendLine.finalDate = temporal.high;
                       trendLine.initialValue = 10;
                       trendLine.finalValue = 19;
                       trendLine.lineColor = "#CC0000";
@@ -358,8 +368,8 @@ var self = this;
 
                       // second trend line
                       trendLine = new AmCharts.TrendLine();
-      trendLine.initialDate = new Date(2016, 7, 8, 12); // 12 is hour - to start trend line in the middle of the day
-      trendLine.finalDate = new Date(2012, 7, 15, 12);
+      trendLine.initialDate = temporal.low; // 12 is hour - to start trend line in the middle of the day
+      trendLine.finalDate = new temporal.high;
                       trendLine.initialValue = 16;
                       trendLine.finalValue = 10;
                       trendLine.lineColor = "#CC0000";