Returns a string which represents the time as date-time defined by RFC 2822:
where zone is [+-]hhmm.
If self is a UTC time, -0000 is used as zone.
time library should be required to use this method as follows.
# File lib/time.rb, line 462 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