add：添加获取时间戳

include/of_util.h

@@ -48,6 +48,8 @@ public:
     static ofString now_time();
     static ofString get_file_size(long long bytes);
     static ofString get_uuid();
+    static uint64_t get_timestamp_ms();
+    static uint64_t get_timestamp_s();
 };
 
 class CMutBuffer

src/of_util.cpp

@@ -150,6 +150,20 @@ ofString OfUtil::get_uuid()
 #endif
 }
 
+uint64_t OfUtil::get_timestamp_ms()
+{
+    auto now = std::chrono::system_clock::now();
+    uint64_t ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()).count();
+    return ms;
+}
+
+uint64_t OfUtil::get_timestamp_s()
+{
+    auto now = std::chrono::system_clock::now();
+    uint64_t s = std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()).count();
+    return s;
+}
+
 #ifdef _WIN32
 std::string CCodec::u8_to_ansi(const std::string& str)
 {