diff --git a/lualib-src/lua-skynet.c b/lualib-src/lua-skynet.c
index 7d75d2ce..063320a4 100644
--- a/lualib-src/lua-skynet.c
+++ b/lualib-src/lua-skynet.c
@@ -326,6 +326,13 @@ ltrash(lua_State *L) {
 	return 0;
 }
 
+static int
+lnow(lua_State *L) {
+	uint64_t ti = skynet_now();
+	lua_pushinteger(L, ti);
+	return 1;
+}
+
 int
 luaopen_skynet_core(lua_State *L) {
 	luaL_checkversion(L);
@@ -344,6 +351,7 @@ luaopen_skynet_core(lua_State *L) {
 		{ "packstring", lpackstring },
 		{ "trash" , ltrash },
 		{ "callback", _callback },
+		{ "now", lnow },
 		{ NULL, NULL },
 	};
 
diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 0bc2d6e9..4a101004 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -299,16 +299,19 @@ function skynet.localname(name)
 	end
 end
 
-function skynet.now()
-	return c.intcommand("NOW")
-end
+skynet.now = c.now
+
+local starttime
 
 function skynet.starttime()
-	return c.intcommand("STARTTIME")
+	if not starttime then
+		starttime = c.intcommand("STARTTIME")
+	end
+	return starttime
 end
 
 function skynet.time()
-	return skynet.now()/100 + skynet.starttime()	-- get now first would be better
+	return skynet.now()/100 + starttime or skynet.starttime()
 end
 
 function skynet.exit()
diff --git a/skynet-src/skynet.h b/skynet-src/skynet.h
index fc8235e0..26df5ac6 100644
--- a/skynet-src/skynet.h
+++ b/skynet-src/skynet.h
@@ -38,5 +38,6 @@ typedef int (*skynet_cb)(struct skynet_context * context, void *ud, int type, in
 void skynet_callback(struct skynet_context * context, void *ud, skynet_cb cb);
 
 uint32_t skynet_current_handle(void);
+uint64_t skynet_now(void);
 
 #endif
diff --git a/skynet-src/skynet_log.c b/skynet-src/skynet_log.c
index 65b97c30..4ce106ff 100644
--- a/skynet-src/skynet_log.c
+++ b/skynet-src/skynet_log.c
@@ -15,11 +15,11 @@ skynet_log_open(struct skynet_context * ctx, uint32_t handle) {
 	sprintf(tmp, "%s/%08x.log", logpath, handle);
 	FILE *f = fopen(tmp, "ab");
 	if (f) {
-		uint32_t starttime = skynet_gettime_fixsec();
-		uint32_t currenttime = skynet_gettime();
+		uint32_t starttime = skynet_starttime();
+		uint64_t currenttime = skynet_now();
 		time_t ti = starttime + currenttime/100;
 		skynet_error(ctx, "Open log file %s", tmp);
-		fprintf(f, "open time: %u %s", currenttime, ctime(&ti));
+		fprintf(f, "open time: %u %s", (uint32_t)currenttime, ctime(&ti));
 		fflush(f);
 	} else {
 		skynet_error(ctx, "Open log file %s fail", tmp);
@@ -30,7 +30,7 @@ skynet_log_open(struct skynet_context * ctx, uint32_t handle) {
 void
 skynet_log_close(struct skynet_context * ctx, FILE *f, uint32_t handle) {
 	skynet_error(ctx, "Close log file :%08x", handle);
-	fprintf(f, "close time: %u\n", skynet_gettime());
+	fprintf(f, "close time: %u\n", (uint32_t)skynet_now());
 	fclose(f);
 }
 
@@ -68,7 +68,7 @@ skynet_log_output(FILE *f, uint32_t source, int type, int session, void * buffer
 	if (type == PTYPE_SOCKET) {
 		log_socket(f, buffer, sz);
 	} else {
-		uint32_t ti = skynet_gettime();
+		uint32_t ti = (uint32_t)skynet_now();
 		fprintf(f, ":%08x %d %d %u ", source, type, session, ti);
 		log_blob(f, buffer, sz);
 		fprintf(f,"\n");
diff --git a/skynet-src/skynet_server.c b/skynet-src/skynet_server.c
index 64258a92..f5d7f6bd 100644
--- a/skynet-src/skynet_server.c
+++ b/skynet-src/skynet_server.c
@@ -429,13 +429,6 @@ cmd_name(struct skynet_context * context, const char * param) {
 	return NULL;
 }
 
-static const char *
-cmd_now(struct skynet_context * context, const char * param) {
-	uint32_t ti = skynet_gettime();
-	sprintf(context->result,"%u",ti);
-	return context->result;
-}
-
 static const char *
 cmd_exit(struct skynet_context * context, const char * param) {
 	handle_exit(context, 0);
@@ -507,7 +500,7 @@ cmd_setenv(struct skynet_context * context, const char * param) {
 
 static const char *
 cmd_starttime(struct skynet_context * context, const char * param) {
-	uint32_t sec = skynet_gettime_fixsec();
+	uint32_t sec = skynet_starttime();
 	sprintf(context->result,"%u",sec);
 	return context->result;
 }
@@ -619,7 +612,6 @@ static struct command_func cmd_funcs[] = {
 	{ "REG", cmd_reg },
 	{ "QUERY", cmd_query },
 	{ "NAME", cmd_name },
-	{ "NOW", cmd_now },
 	{ "EXIT", cmd_exit },
 	{ "KILL", cmd_kill },
 	{ "LAUNCH", cmd_launch },
diff --git a/skynet-src/skynet_timer.c b/skynet-src/skynet_timer.c
index 1f366b85..182b808d 100644
--- a/skynet-src/skynet_timer.c
+++ b/skynet-src/skynet_timer.c
@@ -45,10 +45,9 @@ struct timer {
 	struct link_list t[4][TIME_LEVEL];
 	struct spinlock lock;
 	uint32_t time;
-	uint32_t current;
 	uint32_t starttime;
+	uint64_t current;
 	uint64_t current_point;
-	uint64_t origin_point;
 };
 
 static struct timer * TI = NULL;
@@ -277,13 +276,7 @@ skynet_updatetime(void) {
 	} else if (cp != TI->current_point) {
 		uint32_t diff = (uint32_t)(cp - TI->current_point);
 		TI->current_point = cp;
-
-		uint32_t oc = TI->current;
 		TI->current += diff;
-		if (TI->current < oc) {
-			// when cs > 0xffffffff(about 497 days), time rewind
-			TI->starttime += 0xffffffff / 100;
-		}
 		int i;
 		for (i=0;i<diff;i++) {
 			timer_update(TI);
@@ -292,21 +285,21 @@ skynet_updatetime(void) {
 }
 
 uint32_t
-skynet_gettime_fixsec(void) {
+skynet_starttime(void) {
 	return TI->starttime;
 }
 
-uint32_t 
-skynet_gettime(void) {
+uint64_t 
+skynet_now(void) {
 	return TI->current;
 }
 
 void 
 skynet_timer_init(void) {
 	TI = timer_create_timer();
-	systime(&TI->starttime, &TI->current);
-	uint64_t point = gettime();
-	TI->current_point = point;
-	TI->origin_point = point;
+	uint32_t current = 0;
+	systime(&TI->starttime, &current);
+	TI->current = current;
+	TI->current_point = gettime();
 }
 
diff --git a/skynet-src/skynet_timer.h b/skynet-src/skynet_timer.h
index 4d4e2b0f..b278dbcb 100644
--- a/skynet-src/skynet_timer.h
+++ b/skynet-src/skynet_timer.h
@@ -5,8 +5,7 @@
 
 int skynet_timeout(uint32_t handle, int time, int session);
 void skynet_updatetime(void);
-uint32_t skynet_gettime(void);
-uint32_t skynet_gettime_fixsec(void);
+uint32_t skynet_starttime(void);
 
 void skynet_timer_init(void);