#s(tz
   (#s(span #s(*date 1957 12 16 0 0 0 0) 21600 0 1957)
    #s(span -inf.0 0 0 -inf.0))
   #s(*zone-span 21600 () VOST)
   (#s(span #s(*date 1957 12 16 0 0 0 0) 21600 0 1957)
    #s(span -inf.0 0 0 -inf.0)))