class Time

def to_s(format = NOT_SET) # :nodoc:
  if formatter = DATE_FORMATS[format]
    ActiveSupport::Deprecation.warn(
      "Time#to_s(#{format.inspect}) is deprecated. Please use Time#to_fs(#{format.inspect}) instead."
    )
    formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
  elsif format == NOT_SET
    to_default_s
  else
    ActiveSupport::Deprecation.warn(
      "Time#to_s(#{format.inspect}) is deprecated. Please use Time#to_fs(#{format.inspect}) instead."
    )
    to_default_s
  end
end