diff --git a/htdocs/lib/databases/mssql.lib.php b/htdocs/lib/databases/mssql.lib.php
index 5f383d01ea9..3e6821e7e23 100644
--- a/htdocs/lib/databases/mssql.lib.php
+++ b/htdocs/lib/databases/mssql.lib.php
@@ -479,7 +479,7 @@ class DoliDb
     */
     function idate($param)
     {
-        return strftime("%Y%m%d%H%M%S",$param);
+        return "dbo.from_unixtime(".$param.")";
     }