backport of https://github.com/rails/rails/pull/19604

gistfile1.rb

if Rails::VERSION::MAJOR > 4
  raise "This patch is obsolete and should be removed"
end

class Time
  def compare_with_coercion(other)
  # we're avoiding Time#to_datetime and Time#to_time because they're expensive
    if other.class == Time
      compare_without_coercion(other)
    elsif other.is_a?(Time)
      compare_without_coercion(other.to_time)
    else
      to_datetime <=> other
    end
  end
 alias_method :<=>, :compare_with_coercion
end