diff --git a/htdocs/accountancy/admin/index.php b/htdocs/accountancy/admin/index.php
index 64ebf2d1ab0..2febe354f2e 100644
--- a/htdocs/accountancy/admin/index.php
+++ b/htdocs/accountancy/admin/index.php
@@ -84,7 +84,7 @@ if ($action == 'update') {
 			$constvalue = GETPOST($constname, 'alpha');
 
 			if ($constname == 'ACCOUNTING_DATE_START_BINDING') {
-				$constvalue = dol_mktime(12, 0, 0, GETPOST($constname.'month', 'int'), GETPOST($constname.'day', 'int'), GETPOST($constname.'year', 'int'));
+				$constvalue = dol_mktime(0, 0, 0, GETPOST($constname.'month', 'int'), GETPOST($constname.'day', 'int'), GETPOST($constname.'year', 'int'));
 			}
 
 			if (!dolibarr_set_const($db, $constname, $constvalue, 'chaine', 0, '', $conf->entity)) {