diff --git a/HISTORY.md b/HISTORY.md
index b5641bde..d4066410 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -7,6 +7,7 @@ Dev version
 * socket.listen support put port into address. (address:port)
 * Redesign harbor/master/dummy, remove lots of C code and rewite in lua.
 * Remove block connect api, queue sending message during connecting now.
+* Add skynet.time()
 
 v0.3.2 (2014-6-23)
 ----------
diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 385a6d38..68800d33 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -247,6 +247,10 @@ function skynet.starttime()
 	return tonumber(c.command("STARTTIME"))
 end
 
+function skynet.time()
+	return skynet.starttime() + skynet.now()/100
+end
+
 function skynet.exit()
 	skynet.send(".launcher","lua","REMOVE",skynet.self())
 	c.command("EXIT")
diff --git a/skynet-src/skynet_timer.c b/skynet-src/skynet_timer.c
index 43eb97e7..73f1ab7f 100644
--- a/skynet-src/skynet_timer.c
+++ b/skynet-src/skynet_timer.c
@@ -222,7 +222,7 @@ skynet_timeout(uint32_t handle, int time, int session) {
 
 // centisecond: 1/100 second
 static void
-_systime(uint32_t *sec, uint32_t *cs) {
+systime(uint32_t *sec, uint32_t *cs) {
 #if !defined(__APPLE__)
 	struct timespec ti;
 	clock_gettime(CLOCK_REALTIME, &ti);
@@ -237,33 +237,44 @@ _systime(uint32_t *sec, uint32_t *cs) {
 }
 
 static uint64_t
-_gettime() {
+gettime() {
 	uint64_t t;
 #if !defined(__APPLE__)
+
+#ifdef CLOCK_MONOTONIC_RAW
+#define CLOCK_TIMER CLOCK_MONOTONIC_RAW
+#else
+#define CLOCK_TIMER CLOCK_MONOTONIC
+#endif
+
 	struct timespec ti;
-	clock_gettime(CLOCK_MONOTONIC, &ti);
-	t = ti.tv_sec * 100;
-	t += (uint32_t)(ti.tv_nsec / 10000000);
+	clock_gettime(CLOCK_TIMER, &ti);
+	t = (uint64_t)ti.tv_sec * 100;
+	t += ti.tv_nsec / 10000000;
 #else
 	struct timeval tv;
 	gettimeofday(&tv, NULL);
-	t = ti.tv_sec * 100;
-	t += (uint32_t)(tv.tv_usec / 10000);
+	t = (uint64_t)ti.tv_sec * 100;
+	t += tv.tv_usec / 10000;
 #endif
 	return t;
 }
 
 void
 skynet_updatetime(void) {
-	uint64_t cp = _gettime();
+	uint64_t cp = gettime();
 	if(cp < TI->current_point) {
 		skynet_error(NULL, "time diff error: change from %lld to %lld", cp, TI->current_point);
 	} else if (cp != TI->current_point) {
 		uint32_t diff = (uint32_t)(cp - TI->current_point);
 		TI->current_point = cp;
 
-        // when cs > 0xffffffff(about 49710), time rewind
+		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);
@@ -284,8 +295,8 @@ skynet_gettime(void) {
 void 
 skynet_timer_init(void) {
 	TI = timer_create_timer();
-	_systime(&TI->starttime, &TI->current);
-	uint64_t point = _gettime();
+	systime(&TI->starttime, &TI->current);
+	uint64_t point = gettime();
 	TI->current_point = point;
 	TI->origin_point = point;
 }