diff --git a/app/views/admin/seminar_signups/edit.html.erb b/app/views/admin/seminar_signups/edit.html.erb
index 813f3a3..6555c69 100644
--- a/app/views/admin/seminar_signups/edit.html.erb
+++ b/app/views/admin/seminar_signups/edit.html.erb
@@ -321,7 +321,7 @@ $(".upload").on("change",function(){
 $("#seminar_signup_signup_confirmed").on("change",function () {
   if(this.checked){
     dt = new Date();
-    format = dt.getFullYear() + "/" + dt.getMonth() + "/" + dt.getDate() + " " + dt.getHours() + ":" + dt.getMinutes();
+    format = dt.getFullYear() + "/" + (dt.getMonth() + 1) + "/" + dt.getDate() + " " + dt.getHours() + ":" + dt.getMinutes();
     $("#seminar_signup_signup_confirmed_date").val(format);
   }else{
     $("#seminar_signup_signup_confirmed_date").val("");
@@ -331,7 +331,7 @@ $("#seminar_signup_signup_confirmed").on("change",function () {
 $("#seminar_signup_is_confirmed").on("change",function () {
   if(this.checked){
     dt = new Date();
-    format = dt.getFullYear() + "/" + dt.getMonth() + "/" + dt.getDate() + " " + dt.getHours() + ":" + dt.getMinutes();
+    format = dt.getFullYear() + "/" + (dt.getMonth() + 1) + "/" + dt.getDate() + " " + dt.getHours() + ":" + dt.getMinutes();
     $("#seminar_signup_is_confirmed_date").val(format);
   }else{
     $("#seminar_signup_is_confirmed_date").val("");