class RuboCop::Cop::Rails::Date

def safe_to_time?(node)
  return false unless node.method?(:to_time)
  if node.receiver.str_type?
    zone_regexp = /([+-][\d:]+|\dZ)\z/
    node.receiver.str_content.match(zone_regexp)
  else
    node.arguments.one?
  end
end