<%= f.input :birthday, wrapper: :append do %>
  <%= f.text_field :birthday, :value => @user.birthday.try(:strftime,"%b %d, %Y"), :class => "datetime form-control", :'data-date-end-date' => Date.current.strftime('%m %d, %Y') %>
  <% end %>
<div class="form-group"></div>
<%= f.input :anniversary, wrapper: :append do %>
  <%= f.text_field :anniversary, :value => @user.anniversary.try(:strftime,"%b %d, %Y"), :class => "datetime form-control", :'data-date-end-date' => Date.current.strftime('%m %d, %Y') %>
<% end %>

jQuery(document).on('focus', 'input.datetime', function() {
  opts =  {format: 'M dd, yyyy', autoclose: true};
  jQuery(this).datepicker(opts);
  jQuery(".datepicker").css("z-index",10000);
});