<http://schema.org/datePublished>
"2015-01-28T15:17:56+0100"^^<http://schema.org/Date>
<http://www.lemonde.fr/education/article/2015/01/28/le-redoublement-coute-2-milliards-d-euros-par-an-a-l-etat_4565209_1473685.html>