diff --git a/include/ctools/cTools.h b/include/ctools/cTools.h
index 54eebf5..11782ab 100644
--- a/include/ctools/cTools.h
+++ b/include/ctools/cTools.h
@@ -157,6 +157,16 @@ using namespace cocos2d;
 namespace ct  // cTools
 {
 
+/////////////////////////////////////////////
+////// DATEs Conversions ////////////////////
+/////////////////////////////////////////////
+        
+// convert a string ISO8601 time to epoch time
+bool iso8601ToEpoch(const std::string& vIsoDateTime, const std::string& vTimeFormat, std::time_t& vOutTime);
+
+// convert a epoch time to a string ISO8601 time
+bool epochToISO8601(const std::time_t& vEpochTime, std::string& vOutTime);
+
 /////////////////////////////////////////////
 ////// UTF8 <> WideString ///////////////////
 /////////////////////////////////////////////
@@ -250,6 +260,9 @@ CTOOLS_API std::string toStr(const char* fmt, ...);
 CTOOLS_API std::string toUpper(const std::string& vStr, const std::locale& vLocale = std::locale());
 CTOOLS_API std::string toLower(const std::string& vStr, const std::locale& vLocale = std::locale());
 
+// convert a string byte content to hex string
+CTOOLS_API std::string toHex(const std::string& vStr);
+
 template <typename T>
 ::std::string toStrFromArray(T* arr, size_t n, char delimiter = ';') {
     if (arr) {
diff --git a/src/cTools.cpp b/src/cTools.cpp
index 55c2ab2..ec0ee34 100644
--- a/src/cTools.cpp
+++ b/src/cTools.cpp
@@ -49,6 +49,39 @@ SOFTWARE.
 #include <cwchar>
 #endif
 
+bool ct::iso8601ToEpoch(const std::string& vIsoDateTime, const std::string& vTimeFormat, std::time_t& vOutTime) {
+    if (!vIsoDateTime.empty() && !vTimeFormat.empty()) {
+        struct std::tm time = {};
+        std::istringstream ss(vIsoDateTime);
+        ss >> std::get_time(&time, vTimeFormat.c_str());
+        if (ss.good()) {
+            time.tm_hour = 0;
+            time.tm_min = 0;
+            time.tm_sec = 0;
+#ifdef _WIN32
+            vOutTime = _mkgmtime(&time);
+#else
+            vOutTime = timegm(&time);
+#endif
+            return true;
+        }
+    }
+    return false;
+}
+
+bool ct::epochToISO8601(const std::time_t& vEpochTime, std::string& vOutTime) {
+    auto tp = std::chrono::system_clock::from_time_t(vEpochTime);
+    auto tt = std::chrono::system_clock::to_time_t(tp);
+    auto* timeinfo = std::localtime(&tt);
+    std::ostringstream oss;
+    oss << std::put_time(timeinfo, "%Y-%m-%d");
+    if (oss.good()) {
+        vOutTime = oss.str();
+        return true;
+    }
+    return false;
+}
+
 std::string ct::UTF8Encode(const std::wstring& wstr) {
     std::string res;
 #if defined(__WIN32__) || defined(WIN32) || defined(_WIN32) || defined(__WIN64__) || defined(WIN64) || defined(_WIN64) || defined(_MSC_VER)
@@ -127,6 +160,11 @@ ::std::string ct::toLower(const std::string& vStr, const std::locale& vLocale) {
     return str;
 }
 
+ std::string ct::toHex(const std::string& vStr) {
+    CTOOL_DEBUG_BREAK;
+    return {};
+}
+
 /////////////////////////////////////////////////////////////
 ///////// bitwize ///////////////////////////////////////////
 /////////////////////////////////////////////////////////////