class Zip::ExtraField::UniversalTime

def pack_for_local
  s = [@flag].pack('C')
  s << [@mtime.to_i].pack('l<') unless @flag & MTIME_MASK == 0
  s << [@atime.to_i].pack('l<') unless @flag & ATIME_MASK == 0
  s << [@ctime.to_i].pack('l<') unless @flag & CTIME_MASK == 0
  s
end