class Mail::CommonDateField

def self.normalize_datetime(string)
  if Utilities.blank?(string)
    datetime = ::DateTime.now
  else
    stripped = string.to_s.gsub(/\(.*?\)/, '').squeeze(' ')
    begin
      datetime = ::DateTime.parse(stripped)
    rescue ArgumentError => e
      raise unless 'invalid date' == e.message
    end
  end
  if datetime
    datetime.strftime('%a, %d %b %Y %H:%M:%S %z')
  else
    string
  end
end

def self.singular?
  true
end

def date_time
  ::DateTime.parse("#{element.date_string} #{element.time_string}")
rescue ArgumentError => e
  raise e unless e.message == 'invalid date'
end

def default
  date_time
end

def do_decode
  value.to_s
end

def do_encode
  "#{name}: #{value}\r\n"
end

def element
  @element ||= Mail::DateTimeElement.new(value)
end

def initialize(value = nil, charset = nil)
  super self.class.normalize_datetime(value), charset
end