#s(tz
   (#s(span -inf.0 21600 0 -inf.0 "GMT-6"))
   #s(*zone-span 21600 () "GMT-6")
   (#s(span #s(*date 2039 12 1 0 0 0 21600) 21600 0 2039 "GMT-6")
    #s(span -inf.0 21600 0 -inf.0 "GMT-6")))