diff --git a/infra/monitor/monitor_private.h b/infra/monitor/monitor_private.h
index f366d06..b6a0f37 100644
--- a/infra/monitor/monitor_private.h
+++ b/infra/monitor/monitor_private.h
@@ -243,7 +243,6 @@ extern "C"
         struct timeval time_now;
         struct stm_stat *stat;
         struct stm_spinlock *lock; // for dynamic register command, conn_close_cb
-        int (*gettime_cb)(struct timeval *tv, void *tz);
         struct monitor_connection current_conn;
         struct stm_pktdump_runtime *packet_dump;
 
@@ -282,7 +281,6 @@ extern "C"
     /************************************************************************************************************/
     /* monitor call gettimeofday(2) by default */
     struct stellar_monitor_config *stellar_monitor_config_new(const char *toml);
-    int stellar_monitor_set_gettime_callback(struct stellar_monitor *stm, int (*gettime_cb)(struct timeval *tv, void *tz));
     struct stellar_monitor *stellar_monitor_get(void);
     struct stm_connection_manager *stm_connection_insert(struct evhttp_connection *evconn);
     void stm_connection_update(struct stm_connection_manager *conn_mgr, const struct evhttp_connection *evconn);
diff --git a/infra/monitor/monitor_server.c b/infra/monitor/monitor_server.c
index cd617d3..d2b187a 100644
--- a/infra/monitor/monitor_server.c
+++ b/infra/monitor/monitor_server.c
@@ -194,16 +194,6 @@ static void stm_server_set_default_cfg(struct stellar_monitor_config *config)
     config->output_interval_ms = STM_STAT_OUTPUT_INTERVAL_MS;
 }
 
-int stellar_monitor_set_gettime_callback(struct stellar_monitor *stm, int (*gettime_cb)(struct timeval *tv, void *tz))
-{
-    if (NULL == gettime_cb)
-    {
-        return -1;
-    }
-    stm->gettime_cb = gettime_cb;
-    return 0;
-}
-
 struct stellar_monitor_config *stellar_monitor_config_new(const char *toml_file)
 {
     struct stellar_monitor_config *config = CALLOC(struct stellar_monitor_config, 1);
@@ -532,7 +522,6 @@ struct stellar_monitor *monitor_new(const char *toml_file, struct module_manager
     stm->lock = stm_spinlock_new();
     stm->worker_thread_num = module_manager_get_max_thread_num(mod_mgr);
     assert(stm->worker_thread_num > 0);
-    stm->gettime_cb = gettimeofday;
     stm->aide = stm_cmd_assistant_new();
     if (stm_event_http_init(stm) < 0)
     {
diff --git a/infra/monitor/monitor_transaction.c b/infra/monitor/monitor_transaction.c
index 0f9aba8..312361f 100644
--- a/infra/monitor/monitor_transaction.c
+++ b/infra/monitor/monitor_transaction.c
@@ -18,7 +18,7 @@ struct stm_connection_manager *stm_connection_insert(struct evhttp_connection *e
     {
         if (ele->conn == evconn)
         {
-            stm->gettime_cb(&ele->last_active_time, NULL);
+            gettimeofday(&ele->last_active_time, NULL);
             return ele;
         }
     }
@@ -33,7 +33,7 @@ struct stm_connection_manager *stm_connection_insert(struct evhttp_connection *e
         strncpy(new_conn->peer_ipaddr, tmp_ip_addr, INET6_ADDRSTRLEN - 1);
     }
     new_conn->peer_port_host_order = tmp_port;
-    stm->gettime_cb(&new_conn->link_start_time, NULL);
+    gettimeofday(&new_conn->link_start_time, NULL);
     new_conn->last_active_time = new_conn->link_start_time;
     new_conn->conn = evconn;
     DL_APPEND(stm->connection_mgr, new_conn);
@@ -58,13 +58,12 @@ void stm_connection_delete(struct evhttp_connection *evconn)
 
 void stm_connection_update(struct stm_connection_manager *conn_mgr, const struct evhttp_connection *evconn)
 {
-    struct stellar_monitor *stm = stellar_monitor_get();
     struct stm_connection_manager *ele, *tmp;
     DL_FOREACH_SAFE(conn_mgr, ele, tmp)
     {
         if (ele->conn == evconn)
         {
-            stm->gettime_cb(&ele->last_active_time, NULL);
+            gettimeofday(&ele->last_active_time, NULL);
         }
     }
 }