#s(tz
   (#s(span #s(*date 1992 3 15 0 0 0 -18000) -21600 0 1992 "CST")
    #s(span #s(*date 1992 1 17 0 0 0 -21600) -21600 3600 1992 "CDT")
    #s(span #s(*date 1991 7 1 0 0 0 -18000) -21600 0 1991 "CST")
    #s(span #s(*date 1991 1 19 0 0 0 -21600) -21600 3600 1991 "CDT")
    #s(span #s(*date 1980 6 7 0 0 0 -18000) -21600 0 1980 "CST")
    #s(span #s(*date 1980 2 23 0 0 0 -21600) -21600 3600 1980 "CDT")
    #s(span #s(*date 1979 6 3 0 0 0 -18000) -21600 0 1979 "CST")
    #s(span #s(*date 1979 2 25 0 0 0 -21600) -21600 3600 1979 "CDT")
    #s(span #s(*date 1921 1 15 0 0 0 -20180) -21600 0 1921 "SJMT")
    #s(span #s(*date 1890 1 1 0 0 0 -20180) -20180 0 1890 "LMT")
    #s(span -inf.0 -20180 0 -inf.0 "LMT"))
   #s(*zone-span -21600 () "C~aT")
   (#s(span #s(*date 1890 1 1 0 0 0 -20180) -20180 0 1890 "LMT")
    #s(span -inf.0 -20180 0 -inf.0 "LMT")))