diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index b3b8322..b1a388f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,2 +1,3 @@
+add_subdirectory(timestamp)
 add_subdirectory(session)
 add_subdirectory(stellar)
\ No newline at end of file
diff --git a/src/timestamp/CMakeLists.txt b/src/timestamp/CMakeLists.txt
new file mode 100644
index 0000000..a15c6f8
--- /dev/null
+++ b/src/timestamp/CMakeLists.txt
@@ -0,0 +1,18 @@
+###############################################################################
+# timestamp
+###############################################################################
+
+add_library(timestamp timestamp.cpp)
+target_include_directories(timestamp PUBLIC ${CMAKE_SOURCE_DIR}/src/timestamp)
+target_link_libraries(timestamp)
+
+###############################################################################
+# gtest
+###############################################################################
+
+add_executable(gtest_timestamp gtest_timestamp.cpp)
+target_include_directories(gtest_timestamp PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+target_link_libraries(gtest_timestamp timestamp gtest)
+
+include(GoogleTest)
+gtest_discover_tests(gtest_timestamp)
\ No newline at end of file
diff --git a/src/timestamp/gtest_timestamp.cpp b/src/timestamp/gtest_timestamp.cpp
new file mode 100644
index 0000000..04a1dec
--- /dev/null
+++ b/src/timestamp/gtest_timestamp.cpp
@@ -0,0 +1,28 @@
+#include <gtest/gtest.h>
+
+#include "timestamp.h"
+
+TEST(TIMESTAMP, GET)
+{
+    uint64_t sec = 0;
+    uint64_t msec = 0;
+
+    for (int i = 0; i < 4; i++)
+    {
+        timestamp_update();
+        sec = timestamp_get_sec();
+        msec = timestamp_get_msec();
+
+        printf("current ts in sec  : %lu\n", sec);
+        printf("current ts in msec : %lu\n", msec);
+        EXPECT_TRUE(sec == msec / 1000);
+        sleep(i);
+        printf("sleep %ds\n", i);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}
diff --git a/src/timestamp/timestamp.cpp b/src/timestamp/timestamp.cpp
new file mode 100644
index 0000000..0748c05
--- /dev/null
+++ b/src/timestamp/timestamp.cpp
@@ -0,0 +1,38 @@
+#include <time.h>
+
+#include "timestamp.h"
+
+// 1  s = 1000 ms
+// 1 ms = 1000 us
+// 1 us = 1000 ns
+
+struct timestamp
+{
+    struct timespec ts;
+    uint64_t ts_in_msec;
+    uint64_t ts_in_sec;
+} g_timestamp;
+
+#define ATOMIC_SET(x, y) __atomic_store_n(x, y, __ATOMIC_RELAXED)
+#define ATOMIC_READ(x) __atomic_load_n(x, __ATOMIC_RELAXED)
+
+void timestamp_update()
+{
+    clock_gettime(CLOCK_MONOTONIC, &g_timestamp.ts);
+
+    uint64_t current_timestamp_ms = g_timestamp.ts.tv_sec * 1000 + g_timestamp.ts.tv_nsec / 1000000;
+    uint64_t current_timestamp_sec = g_timestamp.ts.tv_sec + g_timestamp.ts.tv_nsec / 1000000000;
+
+    ATOMIC_SET(&g_timestamp.ts_in_msec, current_timestamp_ms);
+    ATOMIC_SET(&g_timestamp.ts_in_sec, current_timestamp_sec);
+}
+
+uint64_t timestamp_get_sec()
+{
+    return ATOMIC_READ(&g_timestamp.ts_in_sec);
+}
+
+uint64_t timestamp_get_msec()
+{
+    return ATOMIC_READ(&g_timestamp.ts_in_msec);
+}
\ No newline at end of file
diff --git a/src/timestamp/timestamp.h b/src/timestamp/timestamp.h
new file mode 100644
index 0000000..d854ac1
--- /dev/null
+++ b/src/timestamp/timestamp.h
@@ -0,0 +1,19 @@
+#ifndef _TIMESTAMP_H
+#define _TIMESTAMP_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+void timestamp_update();
+uint64_t timestamp_get_sec();
+uint64_t timestamp_get_msec();
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif