diff --git a/Gemfile b/Gemfile
index beab8ce0..ebc72f9e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -88,9 +88,6 @@ gem 'jquery-ui-rails', '~> 6.0.1'
 # for languages validation
 gem 'iso-639'
 
-# as date picker
-gem 'bootstrap3-datetimepicker-rails', '~> 4.17.47'
-
 # data tables
 gem 'ajax-datatables-rails'
 gem 'jquery-datatables-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 053841e6..5e436859 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,8 +99,6 @@ GEM
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
     bootstrap-switch-rails (3.3.3)
-    bootstrap3-datetimepicker-rails (4.17.47)
-      momentjs-rails (>= 2.8.1)
     builder (3.2.4)
     byebug (11.1.3)
     cancancan (3.5.0)
@@ -292,8 +290,6 @@ GEM
     mini_mime (1.1.5)
     mini_portile2 (2.8.6)
     minitest (5.23.1)
-    momentjs-rails (2.29.4.1)
-      railties (>= 3.1)
     monetize (1.13.0)
       money (~> 6.12)
     money (6.19.0)
@@ -618,7 +614,6 @@ DEPENDENCIES
   awesome_nested_set
   bootstrap-sass (~> 3.4.0)
   bootstrap-switch-rails (= 3.3.3)
-  bootstrap3-datetimepicker-rails (~> 4.17.47)
   byebug
   cancancan
   capybara
diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index cf12a085..9a3b692a 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -31,8 +31,6 @@
 //= require momentjs
 //= require leaflet
 //= require holderjs
-//= require bootstrap-datetimepicker
-//= require osem-datepickers
 //= require osem-datatables
 //= require osem-tickets
 //= require bootstrap-switch
diff --git a/app/assets/javascripts/osem-datepickers.js b/app/assets/javascripts/osem-datepickers.js
deleted file mode 100644
index cc23aaa4..00000000
--- a/app/assets/javascripts/osem-datepickers.js
+++ /dev/null
@@ -1,47 +0,0 @@
-// get current_date
-var today = new Date().toISOString().slice(0, 10);
-$(function () {
-  $("input[id^='datetimepicker']").datetimepicker({
-    useCurrent: false,
-    sideBySide: true,
-    format: 'YYYY-MM-DD HH:mm'
-  });
-
-  $('.datetimepicker').datetimepicker({
-    useCurrent: false,
-    sideBySide: true,
-    format: 'YYYY-MM-DD HH:mm'
-  });
-
-   $("#conference-start-datepicker").datetimepicker({
-       useCurrent: false,
-       ignoreReadonly: true,
-       format: "YYYY-MM-DD",
-   });
-
-   $("#conference-end-datepicker").datetimepicker({
-       useCurrent: false,
-       ignoreReadonly: true,
-       format: "YYYY-MM-DD"
-   });
-
-  $("#conference-start-datepicker").on("dp.change",function (e) {
-      $('#conference-end-datepicker').data("DateTimePicker").minDate(e.date);
-      if (!$('#conference-end-datepicker').val()) {
-         $('#conference-end-datepicker').data("DateTimePicker").date(e.date);
-      }
-  });
-
-  $("#conference-start-datepicker").change(function (e) {
-      $('#conference-start-datepicker').val()?$('#conference-end-datepicker').data("DateTimePicker").minDate(e.date):$('#conference-end-datepicker').data("DateTimePicker").minDate(null);
-  });
-
-  $("#conference-end-datepicker").on("dp.change",function (e) {
-      $('#conference-start-datepicker').data("DateTimePicker").maxDate(e.date);
-  });
-
-  $("#conference-end-datepicker").change(function (e) {
-      $('#conference-end-datepicker').val()?$('#conference-start-datepicker').data("DateTimePicker").maxDate(e.date):$('#conference-start-datepicker').data("DateTimePicker").maxDate(null);
-  });
-
-} );
diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 576997ae..02dbfc64 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -9,7 +9,6 @@
  *= require osem-splash
  *= require osem-fonts
  *= require bootstrap-markdown
- *= require bootstrap-datetimepicker
  *= require leaflet
  *= require bootstrap3-switch
  *= require osem-payments
diff --git a/app/assets/stylesheets/jquery-ui-timepicker-addon.css b/app/assets/stylesheets/jquery-ui-timepicker-addon.css
deleted file mode 100644
index b93a85f6..00000000
--- a/app/assets/stylesheets/jquery-ui-timepicker-addon.css
+++ /dev/null
@@ -1,10 +0,0 @@
-.ui-timepicker-div .ui-widget-header { margin-bottom: 8px; }
-.ui-timepicker-div dl { text-align: left; }
-.ui-timepicker-div dl dt { height: 25px; margin-bottom: -25px; }
-.ui-timepicker-div dl dd { margin: 0 10px 10px 65px; }
-.ui-timepicker-div td { font-size: 90%; }
-.ui-tpicker-grid-label { background: none; border: none; margin: 0; padding: 0; }
-
-.ui-timepicker-rtl{ direction: rtl; }
-.ui-timepicker-rtl dl { text-align: right; }
-.ui-timepicker-rtl dl dd { margin: 0 65px 10px 10px; }
\ No newline at end of file
diff --git a/app/assets/stylesheets/strap-on.scss b/app/assets/stylesheets/strap-on.scss
index 571161e6..feeecb29 100644
--- a/app/assets/stylesheets/strap-on.scss
+++ b/app/assets/stylesheets/strap-on.scss
@@ -5,7 +5,6 @@ $navbar-default-color: #ffffff;
 $navbar-default-link-color: #ffffff;
 $navbar-default-link-hover-color: #000000;
 
-@import 'bootstrap-datetimepicker';
 @import "bootstrap-sprockets";
 
 //