class ActiveRecord::AttributeMethods::TimeZoneConversion::TimeZoneConverter

def cast(value)
  return if value.nil?
  if value.is_a?(Hash)
    set_time_zone_without_conversion(super)
  elsif value.respond_to?(:in_time_zone)
    begin
      super(user_input_in_time_zone(value)) || super
    rescue ArgumentError
      nil
    end
  elsif value.respond_to?(:infinite?) && value.infinite?
    value
  else
    map(super) { |v| cast(v) }
  end
end