diff --git a/lib/Utility.js b/lib/Utility.js
index b44a83a3c..1edfe6439 100644
--- a/lib/Utility.js
+++ b/lib/Utility.js
@@ -98,7 +98,7 @@ var Utility = module.exports = {
     if (cst.PM2_LOG_DATE_FORMAT && typeof cst.PM2_LOG_DATE_FORMAT == 'string') {
       // Generate timestamp prefix
       function timestamp(){
-        return `${dayjs(Date.now()).format('YYYY-MM-DDTHH:mm:ss')}:`;
+        return `${dayjs(Date.now()).format(cst.PM2_LOG_DATE_FORMAT)}:`;
       }
 
       var hacks = ['info', 'log', 'error', 'warn'], consoled = {};