Well, it helped me: 
$ perl -MO=Deparse,-p -e 'not $year % 4 xor $year % 100 xor $year % 40
+0;'
(((not ($year % 4)) xor ($year % 100)) xor ($year % 400));

[download]

In reply to Re: Re: Anyone use "xor" in conditionals? by bsb
in thread Anyone use "xor" in conditionals? by bsb

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