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typedef struct _TIME_ZONE_INFORMATION { 
    LONG       Bias; 
...
    SYSTEMTIME DaylightDate; 
    LONG       DaylightBias; 
} TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION;

$tz_struct = pack("LU32S8LU32S8L", 0, " " x 32, 
    unpack("S8",$systime_struct),0, " " x 32, 
    unpack("S8",$systime_struct),0);