diff --git a/public/javascripts/course.js b/public/javascripts/course.js
index b015af857..0c7f4156f 100644
--- a/public/javascripts/course.js
+++ b/public/javascripts/course.js
@@ -663,7 +663,7 @@ function regex_homework_end_publish_time()
     var myDate = new Date();
     if($.trim($("#homework_publish_time").val()) == "")
     {
-        $("#homework_publish_time").val(myDate.getFullYear()+'-'+(myDate.getMonth()+1)+'-'+myDate.getDate());
+        $("#homework_publish_time").val(formate_date(myDate));
     }
     var publish_time = Date.parse($("#homework_publish_time").val());
     var end_time = Date.parse($("#homework_end_time").val());
@@ -695,6 +695,21 @@ function regex_homework_end_time()
     }
 }
 
+function formate_date(date){
+    var str = "";
+    var year = date.getFullYear();
+    var month = date.getMonth() + 1;
+    var day = date.getDate();
+    if(month < 10) {
+        month = '0' + month;
+    }
+    if(day < 10) {
+        day = '0' + day;
+    }
+    str = year + '-' + month + '-' + day;
+    return str;
+}
+
 //验证发送到课程
 function regex_course_id(){
     var course_id = $("#course_id").val();
diff --git a/public/javascripts/new_user.js b/public/javascripts/new_user.js
index 4cf380523..ca7b28ee7 100644
--- a/public/javascripts/new_user.js
+++ b/public/javascripts/new_user.js
@@ -97,7 +97,7 @@ function regex_homework_end_publish_time()
     var myDate = new Date();
     if($.trim($("#homework_publish_time").val()) == "")
     {
-        $("#homework_publish_time").val(myDate.getFullYear()+'-'+(myDate.getMonth()+1)+'-'+myDate.getDate());
+        $("#homework_publish_time").val(formate_date(myDate));
     }
     var end_time = Date.parse($("#homework_end_time").val());
     var publish_time = Date.parse($("#homework_publish_time").val());
@@ -129,6 +129,21 @@ function regex_homework_end_time()
     }
 }
 
+function formate_date(date){
+    var str = "";
+    var year = date.getFullYear();
+    var month = date.getMonth() + 1;
+    var day = date.getDate();
+    if(month < 10) {
+        month = '0' + month;
+    }
+    if(day < 10) {
+        day = '0' + day;
+    }
+    str = year + '-' + month + '-' + day;
+    return str;
+}
+
 //验证发送到课程
 function regex_course_id(){
     var course_id = $("#course_id").val();