Move the JavaScript function reprDuration as a global function in app.js.

static/app.js

@@ -28,6 +28,50 @@ Ext.require('TrackEvents.form.field.UserData');
 Ext.require('TrackEvents.form.field.UserDataMultiDefault');
 Ext.require('TrackEvents.form.plugin.UserDataConsistency');
 
+/**
+ * Global function vonverting a duration in nanosecond into a string.
+ *
+ * @param {Number} value
+ * The duration in seconds
+ *
+ * @return {String}
+ * The duration express as the number of year + the number of months
+ * e.g. "3y + 09m"
+ *
+ */
+reprDuration = function (value) {
+
+    "use strict";
+
+    var duration = value,
+        month, nd, nm, ny, rep, year;
+
+    // duration of year and month in seconds
+    year = 365 * 24 * 3600;
+    month = year / 12;
+
+    // number of years and months
+    ny = Math.floor(duration / year);
+    nm = Math.floor((duration - ny * year) / month);
+
+    // format the number of month
+    nm = Ext.String.leftPad(nm.toString(), 2, '0');
+
+    // format the response
+    if (ny > 0) {
+        rep = Ext.String.format("{0}y + {1}m", ny, nm);
+
+    } else if (nm > 0) {
+        rep = Ext.String.format("{0}m", nm);
+
+    } else {
+        nd = duration / (24 * 3600);
+        rep = Ext.String.leftPad(nd.toString(), 2, '0');
+    }
+
+    return rep;
+};
+
 Ext.onReady(function(){
 
     "use strict";

static/track_events/src/reprDuration.js

-/**
- * Convert a duration in nanosecond into a string.
- *
- * @param {Number} value
- * The duration in seconds
- *
- * @return {String}
- * The duration express as the number of year + the number of months e.g. "3y + 09m"
- *
- */
-function reprDuration(value) {
-
-    "use strict";
-
-    var duration = value,
-        month,
-        nd,
-        nm,
-        ny,
-        rep,
-        year;
-
-    // duration of year and month in seconds
-    year = 365 * 24 * 3600;
-    month = year / 12;
-
-    // number of years and months
-    ny = Math.floor(duration / year);
-    nm = Math.floor((duration - ny * year) / month);
-
-    // format the number of month
-    nm = Ext.String.leftPad(nm.toString(), 2, '0');
-
-    // format the response
-    if (ny > 0) {
-        rep = Ext.String.format("{0}y + {1}m", ny, nm);
-
-    } else if (nm > 0) {
-        rep = Ext.String.format("{0}m", nm);
-
-    } else {
-        nd = duration / (24 * 3600);
-        rep = Ext.String.leftPad(nd.toString(), 2, '0');
-    }
-
-    return rep;
-}