diff --git a/htdocs/core/datepicker.php b/htdocs/core/datepicker.php
index 4db6de685ac..daf63f06d19 100644
--- a/htdocs/core/datepicker.php
+++ b/htdocs/core/datepicker.php
@@ -232,8 +232,8 @@ function displayBox($selectedDate,$month,$year)
 
 		// Sur click dans calendrier, appelle fonction dpClickDay
 		echo "<TD class=\"".$dayclass."\"";
-		echo " onMouseOver=\"dpHighlightDay(".$mydate["year"].",".dol_print_date($thedate,"%m").",".$mydate["mday"].",tradMonths)\"";
-		echo " onClick=\"dpClickDay(".$mydate["year"].",".dol_print_date($thedate,"%m").",".$mydate["mday"].",'".$langs->trans("FormatDateShortJava")."')\"";
+		echo " onMouseOver=\"dpHighlightDay(".$mydate["year"].",parseInt('".dol_print_date($thedate,"%m")."',10),".$mydate["mday"].",tradMonths)\"";
+		echo " onClick=\"dpClickDay(".$mydate["year"].",parseInt('".dol_print_date($thedate,"%m")."',10),".$mydate["mday"].",'".$langs->trans("FormatDateShortJava")."')\"";
 		echo ">".sprintf("%02s",$mydate["mday"])."</TD>";
 		$cols++;
 
@@ -278,4 +278,4 @@ function displayBox($selectedDate,$month,$year)
 		<?php
 }//end function
 
-?>
\ No newline at end of file
+?>