diff --git a/components/libc/compilers/common/sys/time.h b/components/libc/compilers/common/sys/time.h
index 4ca665c536..c2320429e0 100644
--- a/components/libc/compilers/common/sys/time.h
+++ b/components/libc/compilers/common/sys/time.h
@@ -19,6 +19,7 @@
 extern "C" {
 #endif
 
+/* timezone */
 #define DST_NONE    0   /* not on dst */
 #define DST_USA     1   /* USA style dst */
 #define DST_AUST    2   /* Australian style dst */
@@ -31,12 +32,21 @@ extern "C" {
 #define DST_TUR     9   /* Turkey */
 #define DST_AUSTALT 10  /* Australian style with shift in 1986 */
 
-#ifndef _TIMEVAL_DEFINED
-#define _TIMEVAL_DEFINED
+struct timezone {
+  int tz_minuteswest;   /* minutes west of Greenwich */
+  int tz_dsttime;       /* type of dst correction */
+};
+
+void rt_tz_set(rt_int8_t tz);
+rt_int8_t rt_tz_get(void);
+rt_int8_t rt_tz_is_dst(void);
+
 /*
  * Structure returned by gettimeofday(2) system call,
  * and used in other calls.
  */
+#ifndef _TIMEVAL_DEFINED
+#define _TIMEVAL_DEFINED
 #if !(defined(_WIN32))
 struct timeval {
     long    tv_sec;     /* seconds */
@@ -45,18 +55,6 @@ struct timeval {
 #endif
 #endif /* _TIMEVAL_DEFINED */
 
-#if !(defined(__GNUC__) && !defined(__ARMCC_VERSION)/*GCC*/) && !(defined(__ICCARM__) && (__VER__ >= 8010001)) && !defined(_WIN32)
-struct timespec {
-    time_t  tv_sec;     /* seconds */
-    long    tv_nsec;    /* and nanoseconds */
-};
-#endif
-
-struct timezone {
-  int tz_minuteswest;   /* minutes west of Greenwich */
-  int tz_dsttime;       /* type of dst correction */
-};
-
 int stime(const time_t *t);
 time_t timegm(struct tm * const t);
 int gettimeofday(struct timeval *tv, struct timezone *tz);
@@ -67,6 +65,14 @@ struct tm *gmtime_r(const time_t *timep, struct tm *r);
 
 #ifdef RT_USING_POSIX
 #include <sys/types.h>
+
+#if !(defined(__GNUC__) && !defined(__ARMCC_VERSION)/*GCC*/) && !(defined(__ICCARM__) && (__VER__ >= 8010001)) && !defined(_WIN32)
+struct timespec {
+    time_t  tv_sec;     /* seconds */
+    long    tv_nsec;    /* and nanoseconds */
+};
+#endif
+
 /* posix clock and timer */
 #define MILLISECOND_PER_SECOND  1000UL
 #define MICROSECOND_PER_SECOND  1000000UL
@@ -96,15 +102,9 @@ struct tm *gmtime_r(const time_t *timep, struct tm *r);
 int clock_getres  (clockid_t clockid, struct timespec *res);
 int clock_gettime (clockid_t clockid, struct timespec *tp);
 int clock_settime (clockid_t clockid, const struct timespec *tp);
-int clock_time_to_tick(const struct timespec *time);
+int rt_timespec_to_tick(const struct timespec *time);
 #endif /* RT_USING_POSIX */
 
-
-/* timezone APIs (Not standard LIBC APIs) */
-void rt_tz_set(rt_int8_t tz);
-rt_int8_t rt_tz_get(void);
-rt_int8_t rt_tz_is_dst(void);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/libc/compilers/common/time.c b/components/libc/compilers/common/time.c
index 8f4856a330..50f6d4c71e 100644
--- a/components/libc/compilers/common/time.c
+++ b/components/libc/compilers/common/time.c
@@ -24,7 +24,7 @@
 #include "sys/time.h"
 #include <sys/errno.h>
 #include <rtthread.h>
-
+#include <rthw.h>
 #ifdef RT_USING_DEVICE
 #include <rtdevice.h>
 #endif
@@ -465,38 +465,47 @@ RTM_EXPORT(difftime);
 RTM_EXPORT(strftime);
 
 #ifdef RT_USING_POSIX
-static struct timeval _timevalue;
-static int clock_time_system_init()
+
+#ifdef RT_USING_RTC
+static volatile struct timeval _timevalue;
+static int _rt_clock_time_system_init()
 {
-    time_t time;
+    register rt_base_t level;
+    time_t time = 0;
     rt_tick_t tick;
     rt_device_t device;
 
-    time = 0;
-
-#ifdef RT_USING_RTC
     device = rt_device_find("rtc");
     if (device != RT_NULL)
     {
         /* get realtime seconds */
-        rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
+        if(rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time) == RT_EOK)
+        {
+            level = rt_hw_interrupt_disable();
+            tick = rt_tick_get(); /* get tick */
+            _timevalue.tv_usec = (tick%RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
+            _timevalue.tv_sec = time - tick/RT_TICK_PER_SECOND - 1;
+            rt_hw_interrupt_enable(level);
+            return 0;
+        }
     }
-#else
-    LOG_W("Cannot find a RTC device to provide time!");
-#endif
 
-    /* get tick */
-    tick = rt_tick_get();
+    level = rt_hw_interrupt_disable();
+    _timevalue.tv_usec = 0;
+    _timevalue.tv_sec = 0;
+    rt_hw_interrupt_enable(level);
 
-    _timevalue.tv_usec = (tick%RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
-    _timevalue.tv_sec = time - tick/RT_TICK_PER_SECOND - 1;
-
-    return 0;
+    return -1;
 }
-INIT_COMPONENT_EXPORT(clock_time_system_init);
+INIT_COMPONENT_EXPORT(_rt_clock_time_system_init);
+#endif /* RT_USING_RTC */
 
 int clock_getres(clockid_t clockid, struct timespec *res)
 {
+#ifndef RT_USING_RTC
+    LOG_W("Cannot find a RTC device to save time!");
+    return -1;
+#else
     int ret = 0;
 
     if (res == RT_NULL)
@@ -526,11 +535,16 @@ int clock_getres(clockid_t clockid, struct timespec *res)
     }
 
     return ret;
+#endif /* RT_USING_RTC */
 }
 RTM_EXPORT(clock_getres);
 
 int clock_gettime(clockid_t clockid, struct timespec *tp)
 {
+#ifndef RT_USING_RTC
+    LOG_W("Cannot find a RTC device to save time!");
+    return -1;
+#else
     int ret = 0;
 
     if (tp == RT_NULL)
@@ -543,11 +557,14 @@ int clock_gettime(clockid_t clockid, struct timespec *tp)
     {
     case CLOCK_REALTIME:
         {
-            /* get tick */
-            int tick = rt_tick_get();
+            int tick;
+            register rt_base_t level;
 
+            level = rt_hw_interrupt_disable();
+            tick = rt_tick_get(); /* get tick */
             tp->tv_sec  = _timevalue.tv_sec + tick / RT_TICK_PER_SECOND;
             tp->tv_nsec = (_timevalue.tv_usec + (tick % RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK) * 1000;
+            rt_hw_interrupt_enable(level);
         }
         break;
 
@@ -571,11 +588,17 @@ int clock_gettime(clockid_t clockid, struct timespec *tp)
     }
 
     return ret;
+#endif /* RT_USING_RTC */
 }
 RTM_EXPORT(clock_gettime);
 
 int clock_settime(clockid_t clockid, const struct timespec *tp)
 {
+#ifndef RT_USING_RTC
+    LOG_W("Cannot find a RTC device to save time!");
+    return -1;
+#else
+    register rt_base_t level;
     int second;
     rt_tick_t tick;
     rt_device_t device;
@@ -583,38 +606,36 @@ int clock_settime(clockid_t clockid, const struct timespec *tp)
     if ((clockid != CLOCK_REALTIME) || (tp == RT_NULL))
     {
         rt_set_errno(EINVAL);
-
         return -1;
     }
 
     /* get second */
     second = tp->tv_sec;
-    /* get tick */
-    tick = rt_tick_get();
 
+    level = rt_hw_interrupt_disable();
+    tick = rt_tick_get(); /* get tick */
     /* update timevalue */
     _timevalue.tv_usec = MICROSECOND_PER_SECOND - (tick % RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
     _timevalue.tv_sec = second - tick/RT_TICK_PER_SECOND - 1;
+    rt_hw_interrupt_enable(level);
 
-#ifdef RT_USING_RTC
     /* update for RTC device */
     device = rt_device_find("rtc");
     if (device != RT_NULL)
     {
         /* set realtime seconds */
-        rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &second);
+        if(rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &second) == RT_EOK)
+        {
+            return 0;
+        }
     }
-    else
-#else
-    LOG_W("Cannot find a RTC device to save time!");
-#endif
-        return -1;
 
-    return 0;
+    return -1;
+#endif /* RT_USING_RTC */
 }
 RTM_EXPORT(clock_settime);
 
-int clock_time_to_tick(const struct timespec *time)
+int rt_timespec_to_tick(const struct timespec *time)
 {
     int tick;
     int nsecond, second;
@@ -645,19 +666,17 @@ int clock_time_to_tick(const struct timespec *time)
 
     return tick;
 }
-RTM_EXPORT(clock_time_to_tick);
+RTM_EXPORT(rt_timespec_to_tick);
 
 #endif /* RT_USING_POSIX */
 
 
-/* timezone APIs (Not standard LIBC APIs) */
+/* timezone */
 #ifndef RT_LIBC_DEFAULT_TIMEZONE
 #define RT_LIBC_DEFAULT_TIMEZONE    8
 #endif
 
-#include <rthw.h>
-
-volatile static rt_int8_t rt_current_timezone = RT_LIBC_DEFAULT_TIMEZONE;
+static volatile rt_int8_t rt_current_timezone = RT_LIBC_DEFAULT_TIMEZONE;
 
 void rt_tz_set(rt_int8_t tz)
 {
diff --git a/components/libc/pthreads/mqueue.c b/components/libc/pthreads/mqueue.c
index a59c7a445b..6840164a68 100644
--- a/components/libc/pthreads/mqueue.c
+++ b/components/libc/pthreads/mqueue.c
@@ -244,7 +244,7 @@ ssize_t mq_timedreceive(mqd_t                  mqdes,
         return -1;
     }
 
-    tick = clock_time_to_tick(abs_timeout);
+    tick = rt_timespec_to_tick(abs_timeout);
 
     result = rt_mq_recv(mqdes->mq, msg_ptr, msg_len, tick);
     if (result == RT_EOK)
diff --git a/components/libc/pthreads/pthread_cond.c b/components/libc/pthreads/pthread_cond.c
index 59c271bf6e..9bf49704ed 100644
--- a/components/libc/pthreads/pthread_cond.c
+++ b/components/libc/pthreads/pthread_cond.c
@@ -222,7 +222,7 @@ int pthread_cond_timedwait(pthread_cond_t        *cond,
     int timeout;
     rt_err_t result;
 
-    timeout = clock_time_to_tick(abstime);
+    timeout = rt_timespec_to_tick(abstime);
     result = _pthread_cond_timedwait(cond, mutex, timeout);
     if (result == RT_EOK)
         return 0;
diff --git a/components/libc/pthreads/semaphore.c b/components/libc/pthreads/semaphore.c
index 199b33bfe8..5e59ae850f 100644
--- a/components/libc/pthreads/semaphore.c
+++ b/components/libc/pthreads/semaphore.c
@@ -319,7 +319,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout)
         return EINVAL;
 
     /* calculate os tick */
-    tick = clock_time_to_tick(abs_timeout);
+    tick = rt_timespec_to_tick(abs_timeout);
 
     result = rt_sem_take(sem->sem, tick);
     if (result == -RT_ETIMEOUT)
diff --git a/components/libc/signal/posix_signal.c b/components/libc/signal/posix_signal.c
index 45646f63ea..ac8d2b1eef 100644
--- a/components/libc/signal/posix_signal.c
+++ b/components/libc/signal/posix_signal.c
@@ -83,7 +83,7 @@ int sigtimedwait(const sigset_t *set, siginfo_t *info,
 
     if (timeout)
     {
-        tick = clock_time_to_tick(timeout);
+        tick = rt_timespec_to_tick(timeout);
     }
 
     ret = rt_signal_wait(set, info, tick);