diff --git a/BaseTool/BaseTool.cpp b/BaseTool/BaseTool.cpp
index 3ff3472..6654f73 100644
--- a/BaseTool/BaseTool.cpp
+++ b/BaseTool/BaseTool.cpp
@@ -307,6 +307,12 @@ double   cosd(double d)
 }
 
 
+double diffSeconds(std::chrono::system_clock::time_point starttime, std::chrono::system_clock::time_point endtime)
+{
+	std::chrono::duration<double> diff = endtime - starttime; // 返回 duration 对象
+	return diff.count();
+};
+
 std::string   Convert(float Num)
 {
 	std::ostringstream oss;
diff --git a/BaseTool/BaseTool.h b/BaseTool/BaseTool.h
index 84b26e5..a878441 100644
--- a/BaseTool/BaseTool.h
+++ b/BaseTool/BaseTool.h
@@ -104,10 +104,10 @@ typename Clock::time_point parse_iso8601(const std::string& timestamp) {
     // 添加纳秒部分
     auto duration_since_epoch = tp.time_since_epoch();
     auto seconds = std::chrono::duration_cast<std::chrono::seconds>(duration_since_epoch);
-    auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(
-        duration_since_epoch - seconds +
-        std::chrono::duration_cast<std::chrono::nanoseconds>(
-            std::chrono::duration<double>(fractional_seconds)));
+    //auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(
+    //    duration_since_epoch - seconds +
+    //    std::chrono::duration_cast<std::chrono::nanoseconds>(
+    //        std::chrono::duration<double>(fractional_seconds)));
 
     // 计算纳秒部分，并转换为 system_clock::duration
     auto nanoseconds = std::chrono::duration<double>(fractional_seconds);
@@ -141,10 +141,7 @@ std::string format_iso8601_nano(typename Clock::time_point tp) {
     return oss.str();
 };
 
-double diffSeconds(std::chrono::system_clock::time_point starttime, std::chrono::system_clock::time_point endtime) {
-    std::chrono::duration<double> diff = endtime - starttime; // 返回 duration 对象
-    return diff.count();
-};
+double BASECONSTVARIABLEAPI diffSeconds(std::chrono::system_clock::time_point starttime, std::chrono::system_clock::time_point endtime);
 
 
 ///////////////////////////////  基本图像类 结束