diff --git a/bootstrap.datepicker/bootstrap.datepicker-tests.ts b/bootstrap.datepicker/bootstrap.datepicker-tests.ts
index 3346ab5e2..0bbf2c650 100644
--- a/bootstrap.datepicker/bootstrap.datepicker-tests.ts
+++ b/bootstrap.datepicker/bootstrap.datepicker-tests.ts
@@ -1,5 +1,4 @@
-/// <reference path="../jquery/jquery.d.ts"/>
-/// <reference path="bootstrap.datepicker.d.ts"/>
+/// <reference path="bootstrap.datepicker.d.ts"/>
 
 function tests_simple() {
     $('#datepicker').datepicker();
@@ -11,30 +10,32 @@ function tests_simple() {
     $('#datepicker').datepicker('setEndDate', '2012-12-31');
     $('#date-end')
         .datepicker()
-        .on('changeDate', function (ev) { });
+		.on('changeDate', function (ev) { ev; });
 
     var startDate = new Date(2012, 1, 20);
     var endDate = new Date(2012, 1, 25);
     $('#date-start')
         .datepicker()
-        .on('changeDate', function (ev) {
+        //.on("changeDate", function (ev) {		// bug https://typescript.codeplex.com/workitem/1976
+        .on("changeDate", function (ev: DatepickerEventObject) {
             if (ev.date.valueOf() > endDate.valueOf()) {
                 $('#alert').show().find('strong').text('The start date must be before the end date.');
             } else {
                 $('#alert').hide();
-                startDate = new Date(ev.date);
+                startDate = ev.date;
                 $('#date-start-display').text($('#date-start').data('date'));
             }
             $('#date-start').datepicker('hide');
         });
     $('#date-end')
         .datepicker()
-        .on('changeDate', function (ev) {
+        //.on('changeDate', function (ev) {		// bug https://typescript.codeplex.com/workitem/1976
+        .on('changeDate', function (ev: DatepickerEventObject) {
             if (ev.date.valueOf() < startDate.valueOf()) {
                 $('#alert').show().find('strong').text('The end date must be after the start date.');
             } else {
                 $('#alert').hide();
-                endDate = new Date(ev.date);
+                endDate = ev.date;
                 $('#date-end-display').text($('#date-end').data('date'));
             }
             $('#date-end').datepicker('hide');
@@ -55,25 +56,27 @@ $(function () {
     var startDate = new Date(2012, 1, 20);
     var endDate = new Date(2012, 1, 25);
     $('#dp4').datepicker()
-        .on('changeDate', function (ev) {
+        //.on('changeDate', function (ev) {		// bug https://typescript.codeplex.com/workitem/1976
+		.on('changeDate', function (ev: DatepickerEventObject) {
             if (ev.date.valueOf() > endDate.valueOf()) {
                 $('#alert').show().find('strong').text('The start date can not be greater then the end date');
             } else {
                 $('#alert').hide();
-                startDate = new Date(ev.date);
+                startDate = ev.date;
                 $('#startDate').text($('#dp4').data('date'));
             }
             $('#dp4').datepicker('hide');
         });
     $('#dp5').datepicker()
-        .on('changeDate', function (ev) {
+        //.on('changeDate', function (ev) {		// bug https://typescript.codeplex.com/workitem/1976
+		.on('changeDate', function (ev: DatepickerEventObject) {
             if (ev.date.valueOf() < startDate.valueOf()) {
                 $('#alert').show().find('strong').text('The end date can not be less then the start date');
             } else {
                 $('#alert').hide();
-                endDate = new Date(ev.date);
+                endDate = ev.date;
                 $('#endDate').text($('#dp5').data('date'));
             }
             $('#dp5').datepicker('hide');
         });
-});
\ No newline at end of file
+});
diff --git a/bootstrap.datepicker/bootstrap.datepicker.d.ts b/bootstrap.datepicker/bootstrap.datepicker.d.ts
index 4cf27ef19..0664b2aa0 100644
--- a/bootstrap.datepicker/bootstrap.datepicker.d.ts
+++ b/bootstrap.datepicker/bootstrap.datepicker.d.ts
@@ -3,7 +3,6 @@
 // Definitions by: Boris Yankov <https://github.com/borisyankov/>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-
 /// <reference path="../jquery/jquery.d.ts"/>
 
 interface DatepickerOptions {
@@ -19,15 +18,21 @@ interface DatepickerOptions {
     language?: string;
 }
 
+interface DatepickerEventObject extends JQueryEventObject {
+	date: Date;
+	format(format?: string): string;
+}
+
 interface JQuery {
     datepicker(): JQuery;
     datepicker(methodName: string): JQuery;
     datepicker(methodName: string, params: any): JQuery;
     datepicker(options: DatepickerOptions): JQuery;
 
-    off(events?: "changeDate", selector?: any, handler?: (eventObject: any) => any): JQuery;
+	off(events: "changeDate", selector?: string, handler?: (eventObject: DatepickerEventObject) => any): JQuery;
+	off(events: "changeDate", handler: (eventObject: DatepickerEventObject) => any): JQuery;
 
-    on(events: "changeDate", selector?: string, data?: any, handler?: (eventObject: any) => any): JQuery;
-    on(events: "changeDate", selector?: string, handler?: (eventObject: any) => any): JQuery;
-    on(events: "changeDate", handler?: (eventObject: any) => any): JQuery;
+	on(events: "changeDate", selector: string, data: any, handler?: (eventObject: DatepickerEventObject) => any): JQuery;
+	on(events: "changeDate", selector: string, handler: (eventObject: DatepickerEventObject) => any): JQuery;
+	on(events: 'changeDate', handler: (eventObject: DatepickerEventObject) => any): JQuery;
 }