I tried the command and this is what I got: 
$ 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]"
Can't modify single ref constructor in postdecrement (--) at -e line 1
+, near "]--"
syntax error at -e line 1, near "+="
Execution of -e aborted due to compilation errors.

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In reply to Re^2: Diff'ing dates by LighthouseJ
in thread Diff'ing dates (solved) by LighthouseJ

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