diff --git a/version3.0/lib.nas b/version3.0/lib.nas
index 0245a77..8380568 100644
--- a/version3.0/lib.nas
+++ b/version3.0/lib.nas
@@ -129,4 +129,9 @@ var math=
     {
         return nasal_call_builtin_cpp_atan2(x,y);
     },
-};
\ No newline at end of file
+};
+
+var time=func(begin_time)
+{
+    return nasal_call_builtin_time(begin_time);
+}
\ No newline at end of file
diff --git a/version3.0/nasal_builtin.h b/version3.0/nasal_builtin.h
index 2a8e1f7..ae3a36b 100644
--- a/version3.0/nasal_builtin.h
+++ b/version3.0/nasal_builtin.h
@@ -666,4 +666,19 @@ int nasal_runtime::builtin_atan2(int local_scope_addr)
     nasal_vm.gc_get(ret_addr).set_number(atan2(y,x));
     return ret_addr;
 }
+int nasal_runtime::builtin_time(int local_scope_addr)
+{
+    int value_addr=in_builtin_find("begin_time");
+    if(value_addr<0 || nasal_vm.gc_get(value_addr).get_type()!=vm_number)
+    {
+        std::cout<<">> [runtime] builtin_time: cannot find values or wrong value type(must be number)."<<std::endl;
+        ++error;
+        return -1;
+    }
+    time_t begin_time=(time_t)nasal_vm.gc_get(value_addr).get_number();
+    int ret_addr=nasal_vm.gc_alloc();
+    nasal_vm.gc_get(ret_addr).set_type(vm_number);
+    nasal_vm.gc_get(ret_addr).set_number((double)time(&begin_time));
+    return ret_addr;
+}
 #endif
\ No newline at end of file
diff --git a/version3.0/nasal_runtime.h b/version3.0/nasal_runtime.h
index 65bafe5..f7885c9 100644
--- a/version3.0/nasal_runtime.h
+++ b/version3.0/nasal_runtime.h
@@ -10,7 +10,7 @@ enum runtime_returned_state
     rt_exit_without_error
 };
 
-#define BUILTIN_FUNC_NUM 28
+#define BUILTIN_FUNC_NUM 29
 std::string builtin_func_name[BUILTIN_FUNC_NUM]=
 {
     "nasal_call_builtin_std_cout",
@@ -40,7 +40,8 @@ std::string builtin_func_name[BUILTIN_FUNC_NUM]=
     "nasal_call_builtin_exp",
     "nasal_call_builtin_cpp_math_ln",
     "nasal_call_builtin_cpp_math_sqrt",
-    "nasal_call_builtin_cpp_atan2"
+    "nasal_call_builtin_cpp_atan2",
+    "nasal_call_builtin_time"
 };
 
 class nasal_runtime
@@ -127,6 +128,7 @@ private:
     int builtin_ln(int);
     int builtin_sqrt(int);
     int builtin_atan2(int);
+    int builtin_time(int);
 public:
     nasal_runtime();
     ~nasal_runtime();
@@ -1146,6 +1148,7 @@ int nasal_runtime::call_builtin_function(nasal_ast& node,int local_scope_addr)
         case 25:ret_value_addr=builtin_ln(local_scope_addr);break;
         case 26:ret_value_addr=builtin_sqrt(local_scope_addr);break;
         case 27:ret_value_addr=builtin_atan2(local_scope_addr);break;
+        case 28:ret_value_addr=builtin_time(local_scope_addr);break;
     }
     return ret_value_addr;
 }