Fails when extracting some publish_dates

[AndyTheFactory]

Issue by javierdvalle Tue Nov 28 00:21:45 2017 Originally opened as https://github.com/codelucas/newspaper/issues/478

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Is there any way those publish/update dates could be extracted?

http://www.lavanguardia.com/politica/20171127/433237113094/memorandum-urkullu-catalunya.html <time class="story-leaf-datetime" itemprop="dateModified" datetime="2017-11-27T19:20:45.000+01:00" data-timestamp="1511806845000">27/11/2017 01:57 | Actualizado a 27/11/2017 19:20</time>

http://www.ccma.cat/catradio/alacarta/el-mati-de-catalunya-radio/marta-rovira-si-el-bloc-del-155-guanya-aquestes-eleccions-ho-arrasaran-absolutament-tot/audio/983293/ <time class="data" datetime="2017-11-27">27/11/2017</time>

http://www.aljazeera.com/indepth/opinion/elections-catalonia-resolve-crisis-171118142441159.html <div class="article-duration"><time class="timeagofunction" datetime="Sat Nov 18 2017 15:21:41 GMT+0000">18 Nov 2017</time></div>

https://www.naciodigital.cat/noticia/143461/rovira/aquestes/eleccions/van/qui/decideix/catalunya/ciutadans/rajoy <span id="txtactualitzatel" class="txtactualitzatel">| 27/11/2017 a les 10:19h</span>