Try this (untested):

my @args = ('ssh',
            '-o',
            'stricthostkeychecking=no',
             $WLS,
            './script_to_call.pl',
             $OldTime,
             $NewTime,
            "$WLSP/CDSServer11.log");
system(@args);
[download]

@ARGV contains what was passed in on the command line. It is not used for passing to another script. See system.

Hope that helps,