diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1456339..96b3d94 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -172,6 +172,8 @@ set(APP_SOURCES
     "src/core/overloading/AssignmentOperator.cpp"
     "src/core/overloading/ClassMemberAccessOperator.cpp"
     "src/core/overloading/AllocationOperator.cpp"
+    ## Date and Time
+    "src/core/datetime/CTime.cpp"
 )
 
 # Test files
diff --git a/README.md b/README.md
index 9571397..82db833 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,9 @@
 ## 1. Overview
+**TL;DR**
+```bash
+./r
+```
+
 **Project Structure**
 ```
 includes/   → Header files (.h, .hpp)  
@@ -50,6 +55,11 @@ Get-ChildItem -Recurse -Include *.cpp, *.h, *.hpp | ForEach-Object { clang-forma
         $ ./cpp_lab_project
         $ ./cpp_lab_project_test
         ```
+    * Detect Memory Leak Using [valgrind](https://valgrind.org/)
+        ```
+        $ sudo apt install valgrind
+        $ valgrind --leak-check=full -v ./cpp-lab 
+        ```
     * (Optional) Run static analysis - cppcheck
         ```
         $ sudo apt-get install cppcheck
@@ -100,6 +110,21 @@ docker image ls
 docker push DOCKER_USERNAME/cpp-lab
 ```
 
-## 6. TROUBLESHOOTING
+## 6. TroubleShooting
 1. `push access denied, repository does not exist or may require authorization: server message: insufficient_scope: authorization failed`
 => docker login / Docker Desktop login
+
+## 7. Evaluate Executable
+- List all sections:
+```bash
+$ size ./build/cpp-lab
+```
+- The expected output should be the following:
+```bash
+   text    data     bss     dec     hex filename
+  14791     792     280   15863    ./build/cpp-lab
+```
+
+- `.text`: Text Segment - the executable code size, including: complied function, inline, template, constants, string literals
+- `.data`: Initialized Data Segment - the memory for the global, static variables, has init value.
+- `.bss`: Uninitialized Data Segment - global and static variables that are not initialized
\ No newline at end of file
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..3e2906e
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,57 @@
+## NOTE:
+## This file was initially generated with the assistance of AI.
+## The code has been reviewed and may have been modified by the developer
+## to ensure correctness, readability, and compliance with project requirements.
+#!/usr/bin/env bash
+
+set -e  # Exit immediately if a command fails
+
+PROJECT_EXEC="./build/cpp_lab_project"
+BUILD_DIR="./build"
+
+clear
+echo "=============================="
+echo "   Starting build pipeline... "
+echo "=============================="
+
+# Check required tools
+for tool in cmake cppcheck python3; do
+    if ! command -v $tool &> /dev/null; then
+        echo "[ERR]: $tool is not installed."
+        exit 1
+    fi
+done
+
+echo ""
+echo "===========>> Building project..."
+cmake --build "$BUILD_DIR"
+
+echo ""
+echo "===========>> Running cppcheck..."
+cppcheck \
+    --enable=warning,style,performance,portability \
+    --inconclusive \
+    --inline-suppr \
+    --quiet \
+    --error-exitcode=1 \
+    ./src ./include
+
+echo "[OK] Static analysis passed"
+
+echo ""
+echo "===========>> Generating commit id..."
+python3 ./private/genid.py
+
+echo ""
+echo "===========>> Running program..."
+if [ -f "$PROJECT_EXEC" ]; then
+    "$PROJECT_EXEC"
+else
+    echo "[ERR] Executable not found: $PROJECT_EXEC"
+    exit 1
+fi
+
+echo ""
+echo "=============================="
+echo "Pipeline finished successfully!"
+echo "=============================="
\ No newline at end of file
diff --git a/src/core/datetime/CTime.cpp b/src/core/datetime/CTime.cpp
new file mode 100644
index 0000000..8969c29
--- /dev/null
+++ b/src/core/datetime/CTime.cpp
@@ -0,0 +1,39 @@
+#include <iostream>
+#include "ExampleRegistry.h"
+
+#include <ctime>
+
+namespace {
+void run() {
+  // **1. Get the current timestamp**
+  std::time_t now = time(NULL);
+  const auto* ts = ctime(&now);
+  std::cout << "Current time: " << ts << '\n';
+
+  // **2. Create the dt structure**
+  struct tm datetime = *localtime(&now);
+  std::cout << "Year: " << datetime.tm_year + 1900 << '\n';
+  std::cout << "Current time stamp: " << mktime(&datetime) << '\n';
+
+  // **3. Formatting**
+  char output[50];
+  strftime(output, 50, "%B %e, %Y", &datetime);
+  std::cout << output << "\n";
+  strftime(output, 50, "%I:%M:%S %p", &datetime);
+  std::cout << output << "\n";
+  strftime(output, 50, "%m/%d/%y", &datetime);
+  std::cout << output << "\n";
+  strftime(output, 50, "%a %b %e %H:%M:%S %Y", &datetime);
+  std::cout << output << "\n";
+}
+}  // namespace
+
+class CTime : public IExample {
+ public:
+  std::string group() const override { return "core/datetime"; }
+  std::string name() const override { return "CTime"; }
+  std::string description() const override { return ""; }
+  void execute() override { run(); }
+};
+
+REGISTER_EXAMPLE(CTime, "core/datetime", "CTime");
\ No newline at end of file
diff --git a/src/core/datetime/REAME.md b/src/core/datetime/REAME.md
new file mode 100644
index 0000000..7fec4c5
--- /dev/null
+++ b/src/core/datetime/REAME.md
@@ -0,0 +1,23 @@
+# Date and Time
+- <ctime> : provides functions and types to work with date and time values including parsing and formatting (inherited from C)
+
+- <chrono>: provides facilities to deal with the duration time points and clocks (std11), it is more modern and type-safe approach
+
+## ctime
+- Data Types:
+  - `time_t`: for timestamps
+  - `struct tm`: for datetime structes 
+  - Use `mktime()` to convert struct tm to time_t, and `localtime()` and `gmtime()` for vice versa
+- `strftime()` format:
+>%a	Short representation of the weekday	Fri
+%b	Short representation of the month name	Dec
+%B	Full representation of the month name	December
+%d	Day of the month with leading zero	09
+%e	Day of the month with leading spaces	 9
+%H	24-hour format of an hour	14
+%I	12-hour format of an hour	02
+%M	Minutes within an hour	30
+%p	AM or PM	PM
+%S	Seconds within a minute	01
+%y	2-digit year representation	23
+%Y	4-digit year representation	2023
\ No newline at end of file
diff --git a/src/core/exception/BasicHandle.cpp b/src/core/exception/BasicHandle.cpp
index af5f026..77410e7 100644
--- a/src/core/exception/BasicHandle.cpp
+++ b/src/core/exception/BasicHandle.cpp
@@ -12,7 +12,7 @@ void run() {
       errorFnc();
     } catch (std::exception& e) {
       std::cout << e.what();
-      throw std::runtime_error("[M] Middle error \n");
+      throw std::runtime_error("[M] Middle error \n");  // use as custom exception
       //   throw;   // rethrow
     }
   } catch (std::exception& e) {
diff --git a/src/core/filehandle/StringStream.cpp b/src/core/filehandle/StringStream.cpp
index 9185084..8eb3a12 100644
--- a/src/core/filehandle/StringStream.cpp
+++ b/src/core/filehandle/StringStream.cpp
@@ -10,7 +10,7 @@ void runStringStreamExample() {
 
   std::stringstream os{};
 
-  // input
+  // input:   std::istringstream iss;
   os << "0xF";
   std::cout << os.str();
 
@@ -19,7 +19,7 @@ void runStringStreamExample() {
   os.clear();
   std::cout << os.str();
 
-  // output
+  // output: std::ostringstream oss;
   std::string bytesStr = os.str();
   std::cout << bytesStr;