rfc2822()
  public
  
    
    
Returns a string which represents the time as date-time defined by RFC
2822:
day-of-week, DD month-name CCYY hh:mm:ss zone
where zone is [+-]hhmm.
If self is a UTC time, -0000 is used as zone.
You must require ‘time’ to use this method.
   
  
    Show source    
    
      
  def rfc2822
    sprintf('%s, %02d %s %0*d %02d:%02d:%02d ',
      RFC2822_DAY_NAME[wday],
      day, RFC2822_MONTH_NAME[mon-1], year < 0 ? 5 : 4, year,
      hour, min, sec) <<
    if utc?
      '-0000'
    else
      off = utc_offset
      sign = off < 0 ? '-' : '+'
      sprintf('%s%02d%02d', sign, *(off.abs / 60).divmod(60))
    end
  end