diff --git a/core/src/lib/parse_conf.h b/core/src/lib/parse_conf.h
index f1afe6c43ee..97acda88600 100644
--- a/core/src/lib/parse_conf.h
+++ b/core/src/lib/parse_conf.h
@@ -423,7 +423,8 @@ static std::string TPAsString(const std::chrono::system_clock::time_point& tp)
 {
   std::time_t t = std::chrono::system_clock::to_time_t(tp);
   char str[100];
-  if (!std::strftime(str, sizeof(str), "%F_%H:%M:%S", std::localtime(&t))) {
+  if (!std::strftime(str, sizeof(str), "%Y-%m-%d_%H:%M:%S",
+                     std::localtime(&t))) {
     return std::string("strftime error");
   }
   std::string ts = str;