class ActiveAdmin::Inputs::Filters::DateRangeInput

def gt_input_name
  "#{method}_gteq"
end

def input_html_options(input_name = gt_input_name)
  current_value = @object.public_send input_name
  { size: 12,
    class: "datepicker",
    max: 10,
    value: current_value.respond_to?(:strftime) ? current_value.strftime("%Y-%m-%d") : "" }
end

def lt_input_name
  "#{method}_lteq"
end

def to_html
  input_wrapping do
    [ label_html,
      builder.text_field(gt_input_name, input_html_options(gt_input_name)),
      template.content_tag(:span, "-", class: "seperator"),
      builder.text_field(lt_input_name, input_html_options(lt_input_name)),
    ].join("\n").html_safe
  end
end