Use single quotes on UNIX-like operating systems: 
echo -e "Sun 09 30 06 42 36 2007\nTue 10 02 06 01 55 2007\n" | \
perl -MTime::Local -lane 'END{print$t}$F[1]--;$t+=($.*2-3)*timelocal@F
+[5,4,3,2,1,6]'

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Double quotes cause your shell to interpret e.g. $t as a shell variable.

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In reply to Re^3: Diff'ing dates by shmem
in thread Diff'ing dates (solved) by LighthouseJ

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