diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 88e7f9b5b43..6b0950b4f8d 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -5669,7 +5669,7 @@ class Form
             {
                 $reset_scripts .= 'jQuery(\'#'.$prefix.'\').val(d.toLocaleDateString(\''.str_replace('_', '-', $langs->defaultlang).'\'));';
                 $reset_scripts .= 'jQuery(\'#'.$prefix.'day\').val(d.getDate().pad());';
-                $reset_scripts .= 'jQuery(\'#'.$prefix.'month\').val(d.getMonth().pad());';
+                $reset_scripts .= 'jQuery(\'#'.$prefix.'month\').val(parseInt(d.getMonth().pad()) + 1);';
                 $reset_scripts .= 'jQuery(\'#'.$prefix.'year\').val(d.getFullYear());';
             }
 			/*if ($usecalendar == "eldy")