# File lib/et-orbi.rb, line 374
    def to_offset(n)

      i = n.to_i
      sn = i < 0 ? '-' : '+'; i = i.abs
      hr = i / 3600; mn = i % 3600; sc = i % 60

      sc > 0 ?
        '%s%02d:%02d:%02d' % [ sn, hr, mn, sc ] :
        '%s%02d:%02d' % [ sn, hr, mn ]
    end