diff --git a/js/app/views/IntervalUI.js b/js/app/views/IntervalUI.js
index 14a039c..42e2f13 100644
--- a/js/app/views/IntervalUI.js
+++ b/js/app/views/IntervalUI.js
@@ -122,7 +122,7 @@ Ext.define('amdaUI.IntervalUI', {
 		// get stop value
 		var stop = this.getStopTime();
 		// if duration computable
-		if (stop != null && start != null) {
+		if (Ext.isDate(start) && Ext.isDate(stop)) {
             if ( stop <= start ) {
                 form.findField('stopDate').markInvalid('Stop Time  must be after Start Time');
             } else {
diff --git a/js/app/views/PlotComponents/PlotZoomPlug.js b/js/app/views/PlotComponents/PlotZoomPlug.js
index 110dda9..dcb91ed 100644
--- a/js/app/views/PlotComponents/PlotZoomPlug.js
+++ b/js/app/views/PlotComponents/PlotZoomPlug.js
@@ -218,7 +218,7 @@ Ext.define('amdaPlotComp.PlotZoomPlug', {
       items: [
         {
           xtype: 'datefield', name: 'zoom-min-time', fieldLabel: 'Start Time',
-          format: 'Y/m/d H:i:s.u'
+          format: 'Y/m/d H:i:s.u', 
         },
         {
           xtype: 'datefield', name: 'zoom-max-time', fieldLabel: 'Stop Time',
@@ -387,7 +387,7 @@ Ext.define('amdaPlotComp.PlotZoomPlug', {
 
     this.form = new Ext.form.FormPanel({
       frame: true,
-      width: 250,
+      width: 255,
       layout: {
         type: 'vbox',
         pack: 'start',
--
libgit2 0.21.2