def strftime(format)
      format = format.gsub('%Z', zone).gsub('%z', formatted_offset(false))
      time.strftime(format)
    end
def strftime(format)
      format = format.gsub('%Z', zone).gsub('%z', formatted_offset(false))
      time.strftime(format)
    end
Replaces <tt>%Z</tt> and <tt>%z</tt> directives with +zone+ and +formatted_offset+, respectively, before passing to
 Time#strftime, so that zone information is correct