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use Modern::Perl;
use DateTime;
...
2012-01-15.pdf
2012-02-01.pdf
2012-02-15.pdf

<a href="2012-01-01.pdf">January 1, 2012</a>
<a href="2012-01-15.pdf">January 15, 2012</a>
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<a href="2012-05-01.pdf">May 1, 2012</a>
<a href="2012-05-15.pdf">May 15, 2012</a>
<a href="2012-05-20.pdf">May 20, 2012</a>