diff --git a/components/libc/compilers/armlibc/sys/time.h b/components/libc/compilers/armlibc/sys/time.h
index e5751cfa3d6a039f291987bc7ecc0d04fe383c82..bac122e183f2922c3f3c029fb5f81644743345a6 100644
--- a/components/libc/compilers/armlibc/sys/time.h
+++ b/components/libc/compilers/armlibc/sys/time.h
@@ -45,6 +45,7 @@ struct timezone {
 };
 
 int gettimeofday(struct timeval *tp, void *ignore);
+struct tm *gmtime_r(const time_t *timep, struct tm *r);
 
 #ifdef __cplusplus
 }
diff --git a/components/libc/compilers/armlibc/time.c b/components/libc/compilers/armlibc/time.c
index 29c5c6cdd2ca818a9cb8ca3b0a1ea60f10a6a5d3..5d151fb301f46e2a893fc8f0d64aa5371678cbdb 100644
--- a/components/libc/compilers/armlibc/time.c
+++ b/components/libc/compilers/armlibc/time.c
@@ -9,6 +9,27 @@
 #include <sys/time.h>
 #include <rtthread.h>
 
+/* days per month -- nonleap! */
+const short __spm[13] =
+{
+    0,
+    (31),
+    (31 + 28),
+    (31 + 28 + 31),
+    (31 + 28 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
+};
+
+/* seconds per day */
+#define SPD 24*60*60
+
 #ifdef RT_USING_DEVICE
 int gettimeofday(struct timeval *tp, void *ignore)
 {
@@ -79,6 +100,59 @@ time_t time(time_t *t)
     return time_now;
 }
 
+static int __isleap(int year)
+{
+    /* every fourth year is a leap year except for century years that are
+     * not divisible by 400. */
+    /*  return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
+    return (!(year % 4) && ((year % 100) || !(year % 400)));
+}
+
+/**
+ * This function will convert Time (Restartable)
+ *
+ * @param timep the timestamp
+ * @param the structure to stores information
+ *
+ * @return the structure to stores information
+ *
+ */
+struct tm *gmtime_r(const time_t *timep, struct tm *r)
+{
+    time_t i;
+    register time_t work = *timep % (SPD);
+    r->tm_sec = work % 60;
+    work /= 60;
+    r->tm_min = work % 60;
+    r->tm_hour = work / 60;
+    work = *timep / (SPD);
+    r->tm_wday = (4 + work) % 7;
+    for (i = 1970;; ++i)
+    {
+        register time_t k = __isleap(i) ? 366 : 365;
+        if (work >= k)
+            work -= k;
+        else
+            break;
+    }
+    r->tm_year = i - 1900;
+    r->tm_yday = work;
+
+    r->tm_mday = 1;
+    if (__isleap(i) && (work > 58))
+    {
+        if (work == 59)
+            r->tm_mday = 2; /* 29.2. */
+        work -= 1;
+    }
+
+    for (i = 11; i && (__spm[i] > work); --i)
+        ;
+    r->tm_mon = i;
+    r->tm_mday += work - __spm[i];
+    return r;
+}
+
 RT_WEAK clock_t clock(void)
 {
     return rt_tick_get();
diff --git a/components/libc/compilers/dlib/sys/time.h b/components/libc/compilers/dlib/sys/time.h
index 766d219fafe32c4343a9a044c7d4dc7cff124c9e..baf566936b0ec55f4c06fb68b8109ea8c01c9d70 100644
--- a/components/libc/compilers/dlib/sys/time.h
+++ b/components/libc/compilers/dlib/sys/time.h
@@ -52,6 +52,7 @@ struct timezone {
 };
 
 int gettimeofday(struct timeval *tp, void *ignore);
+struct tm *gmtime_r(const time_t *timep, struct tm *r);
 
 #ifdef __cplusplus
 }
diff --git a/components/libc/compilers/dlib/time.c b/components/libc/compilers/dlib/time.c
index 12c7f893e97d8f9c90e169f5381d28d08f4bd3fc..88a61fab9160c6713ff33367d07f144ef2c639bf 100644
--- a/components/libc/compilers/dlib/time.c
+++ b/components/libc/compilers/dlib/time.c
@@ -9,6 +9,27 @@
 #include <sys/time.h>
 #include <rtthread.h>
 
+/* days per month -- nonleap! */
+const short __spm[13] =
+{
+    0,
+    (31),
+    (31 + 28),
+    (31 + 28 + 31),
+    (31 + 28 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30),
+    (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
+};
+
+/* seconds per day */
+#define SPD 24*60*60
+
 #ifdef RT_USING_DEVICE
 int gettimeofday(struct timeval *tp, void *ignore)
 {
@@ -78,6 +99,59 @@ __time32_t __time32(__time32_t *t)
   return time_now;
 }
 
+static int __isleap(int year)
+{
+    /* every fourth year is a leap year except for century years that are
+     * not divisible by 400. */
+    /*  return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
+    return (!(year % 4) && ((year % 100) || !(year % 400)));
+}
+
+/**
+ * This function will convert Time (Restartable)
+ *
+ * @param timep the timestamp
+ * @param the structure to stores information
+ *
+ * @return the structure to stores information
+ *
+ */
+struct tm *gmtime_r(const time_t *timep, struct tm *r)
+{
+    time_t i;
+    register time_t work = *timep % (SPD);
+    r->tm_sec = work % 60;
+    work /= 60;
+    r->tm_min = work % 60;
+    r->tm_hour = work / 60;
+    work = *timep / (SPD);
+    r->tm_wday = (4 + work) % 7;
+    for (i = 1970;; ++i)
+    {
+        register time_t k = __isleap(i) ? 366 : 365;
+        if (work >= k)
+            work -= k;
+        else
+            break;
+    }
+    r->tm_year = i - 1900;
+    r->tm_yday = work;
+
+    r->tm_mday = 1;
+    if (__isleap(i) && (work > 58))
+    {
+        if (work == 59)
+            r->tm_mday = 2; /* 29.2. */
+        work -= 1;
+    }
+
+    for (i = 11; i && (__spm[i] > work); --i)
+        ;
+    r->tm_mon = i;
+    r->tm_mday += work - __spm[i];
+    return r;
+}
+
 RT_WEAK clock_t clock(void)
 {
     return rt_tick_get();
diff --git a/include/rtthread.h b/include/rtthread.h
index 254da139ea359ee03744b15d99d647931035731d..fc5029a22003839cf9c96e9ec34396bf7ce276c1 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -473,7 +473,6 @@ rt_int32_t rt_vsprintf(char *dest, const char *format, va_list arg_ptr);
 rt_int32_t rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args);
 rt_int32_t rt_sprintf(char *buf, const char *format, ...);
 rt_int32_t rt_snprintf(char *buf, rt_size_t size, const char *format, ...);
-struct tm *rt_gmtime_r(const time_t *timep, struct tm *result);
 
 #if defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE)
 rt_device_t rt_console_set_device(const char *name);
diff --git a/src/kservice.c b/src/kservice.c
index d920e523232e639f41de3ccea22b28f64b20dde5..dbc4a2fb0e0bb383ec91fa730bb5c69317ea1118 100644
--- a/src/kservice.c
+++ b/src/kservice.c
@@ -1177,68 +1177,6 @@ void rt_kprintf(const char *fmt, ...)
 RTM_EXPORT(rt_kprintf);
 #endif
 
-/**
- * This function will convert Time (Restartable)
- *
- * @param timep the timestamp
- * @param result the structure to stores information
- */
-struct tm *rt_gmtime_r(const time_t *timep, struct tm *result)
-{
-#define IS_LEAP_YEAR(year) (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
-
-    const rt_uint32_t mon_table[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
-    rt_uint32_t year = 1970, month = 0;
-    rt_uint32_t daycount = 0, second = 0, number = 0;
-
-    second = *timep % (24 * 60 * 60);
-    result->tm_hour = second / 3600;
-    result->tm_min = (second % 3600) / 60;
-    result->tm_sec = (second % 3600) % 60;
-
-    daycount = *timep / (24 * 60 * 60);
-    result->tm_wday = (daycount + 4) % 7;
-    if (daycount != 0)
-    {
-        while (daycount >= 365)
-        {
-            number = IS_LEAP_YEAR(year) ? 366 : 365;
-            if (daycount >= number)
-            {
-                daycount -= number;
-                year++;
-            }
-            else
-                break;
-        }
-        result->tm_year = year - 1900;
-        result->tm_yday = daycount;
-
-        while (daycount >= 28)
-        {
-            if (month == 1 && IS_LEAP_YEAR(year))
-            {
-                if (daycount >= 29)
-                    daycount -= 29;
-                else
-                    break;
-            }
-            else
-            {
-                if (daycount >= mon_table[month])
-                    daycount -= mon_table[month];
-                else
-                    break;
-            }
-            month++;
-        }
-        result->tm_mon = month;
-        result->tm_mday = daycount + 1;
-    }
-    return result;
-}
-RTM_EXPORT(rt_gmtime_r);
-
 #ifdef RT_USING_HEAP
 /**
  * This function allocates a memory block, which address is aligned to the