diff --git a/core/class/history.class.php b/core/class/history.class.php
index 0035469145..95e845d56f 100644
--- a/core/class/history.class.php
+++ b/core/class/history.class.php
@@ -985,7 +985,7 @@ public static function getHistoryFromCalcul($_strcalcul, $_dateStart = null, $_d
 				if (count($matches[1]) != count($cmd_history)) {
 					continue;
 				}
-				$datetime = floatval(strtotime($datetime . ' UTC'));
+				$datetime = strtotime($datetime . ' UTC');
 				$calcul = template_replace($cmd_history, $_strcalcul);
 				if ($_noCalcul) {
 					$value[$datetime] = $calcul;