Going back to jquery rails before 4.1, to correct the date picker

Gemfile

@@ -107,7 +107,7 @@ group :development, :test, :assets do
   gem 'coffee-rails'
 
   # Use jquery as the JavaScript library
-  gem 'jquery-rails'
+  gem 'jquery-rails', '< 4.1'
   # Turbolinks makes following links in your web application
   # faster. Read more: https://github.com/rails/turbolinks
   gem 'turbolinks'

Gemfile.lock

@@ -229,7 +229,7 @@ GEM
     jbuilder (2.4.1)
       activesupport (>= 3.0.0, < 5.1)
       multi_json (~> 1.2)
-    jquery-rails (4.1.0)
+    jquery-rails (4.0.5)
       rails-dom-testing (~> 1.0)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
@@ -464,7 +464,7 @@ DEPENDENCIES
   http_accept_language
   i18n-active_record!
   jbuilder
-  jquery-rails
+  jquery-rails (< 4.1)
   jquery-sparkline-rails!
   jquery-turbolinks
   leaflet-markercluster-rails