diff --git a/core/core.php b/core/core.php
index d7444177..13953517 100644
--- a/core/core.php
+++ b/core/core.php
@@ -1074,8 +1074,8 @@ class common
 				foreach ($this->getData(['module', $parentPageId, 'posts']) as $articleId => $article) {
 					if ($this->getData(['module', $parentPageId, 'posts', $articleId, 'state']) === true) {
 						$date = $this->getData(['module', $parentPageId, 'posts', $articleId, 'publishedOn']);
-						$sitemap->addUrl('/' . $parentPageId . '/' . $articleId, new DateTime("@{$date}", new DateTimeZone($timezone)));
-											}
+						$sitemap->addUrl('/' . $parentPageId . '/' . $articleId, DateTime::createFromFormat('U', $date));
+					}
 				}
 			}
 			// Sous-pages
@@ -1097,7 +1097,7 @@ class common
 						if ($this->getData(['module', $childKey, 'posts', $articleId, 'state']) === true) {
 							$date = $this->getData(['module', $childKey, 'posts', $articleId, 'publishedOn']);
 							$sitemap->addUrl('/' . $childKey . '/' . $articleId, new DateTime("@{$date}", new DateTimeZone($timezone)));
-													}
+						}
 					}
 				}
 			}