diff --git a/Makefile b/Makefile
index 399a0b1..87b1fc5 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 # https://github.com/kala13x/smake #
 ####################################
 
-CFLAGS = -D_XUTILS_USE_SSL -g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU
+CFLAGS = -D_XUTILS_USE_SSL -g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU -D_ASSERT_TIMED
 CFLAGS += -I./src/crypt -I./src/data -I./src/net -I./src/sys -I./src
 LIBS = -lssl -lcrypto -lpthread
 NAME = libxutils.a
diff --git a/misc/Makefile.tmp b/misc/Makefile.tmp
index 2a05709..4137d24 100644
--- a/misc/Makefile.tmp
+++ b/misc/Makefile.tmp
@@ -3,7 +3,7 @@
 # https://github.com/kala13x/smake #
 ####################################
 
-CFLAGS = _SSL_FLAGS_ -g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU
+CFLAGS = _SSL_FLAGS_ -g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU -D_ASSERT_TIMED
 CFLAGS += -I./src/crypt -I./src/data -I./src/net -I./src/sys -I./src
 LIBS = _SSL_LIBS_ -lpthread
 NAME = libxutils.a
diff --git a/misc/smake.tmp b/misc/smake.tmp
index 9dc7cc1..ce7a7b8 100644
--- a/misc/smake.tmp
+++ b/misc/smake.tmp
@@ -2,7 +2,7 @@
     "build": {
         "name": "libxutils.a",
         "outputDir": "./build",
-        "flags": "-g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU",
+        "flags": "-g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU -D_ASSERT_TIMED",
         "libs": "-lpthread",
         "overwrite": true,
         "verbose": 2,
diff --git a/smake.json b/smake.json
index 407096b..e26fd2c 100644
--- a/smake.json
+++ b/smake.json
@@ -2,7 +2,7 @@
     "build": {
         "name": "libxutils.a",
         "outputDir": "./build",
-        "flags": "-g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU",
+        "flags": "-g -O2 -Wall -D_XUTILS_DEBUG -D_XUTILS_USE_GNU -D_ASSERT_TIMED",
         "libs": "-lpthread",
         "overwrite": true,
         "verbose": 2,
diff --git a/src/xdef.h b/src/xdef.h
index 3ef8c85..1c7f4af 100644
--- a/src/xdef.h
+++ b/src/xdef.h
@@ -110,6 +110,25 @@ typedef uint8_t             xbool_t;
 #define XLOCATION_LVL2(line)    XLOCATION_LVL1(line)
 #define __XLOCATION__           XLOCATION_LVL2(__LINE__)
 
+#ifdef _ASSERT_TIMED
+#include <time.h>
+#define XTROW_LOCATION                          \
+    {                                           \
+        char timeStr[20];                       \
+        time_t now = time(NULL);                \
+        struct tm *tmInfo = localtime(&now);    \
+        strftime(timeStr, sizeof(timeStr),      \
+                "%H:%M:%S.%03d", tmInfo );      \
+        printf("%s %s<error>%s "                \
+            "Assert failed: "                   \
+            "%s:%s():%s\n",                     \
+            XCLR_RED, XCLR_RES,                 \
+            timeStr,                            \
+            __FILE__,                           \
+            __FUNCTION__,                       \
+            __XLOCATION__);                     \
+    }
+#else
 #define XTROW_LOCATION                          \
             printf("%s<error>%s "               \
                 "Assert failed: "               \
@@ -118,6 +137,7 @@ typedef uint8_t             xbool_t;
                 __FILE__,                       \
                 __FUNCTION__,                   \
                 __XLOCATION__)
+#endif
 
 #define XASSERT_RET(condition, value)           \
     if (!condition) return value