Some works to add a getDateTime function.

modules/core/include/visp3/core/vpIoTools.h

@@ -160,6 +160,7 @@ class VISP_EXPORT vpIoTools
   static std::string getUserName();
   static std::string getenv(const std::string &env);
   static std::string getViSPImagesDataPath();
+  static std::string getDateTime(const std::string &format="%Y-%m-%d_%H-%M-%S");
   static void getVersion(const std::string &version, unsigned int &major, unsigned int &minor, unsigned int &patch);
   static bool checkDirectory(const std::string &dirname);
   static bool checkFifo(const std::string &filename);

modules/core/src/tools/file/vpIoTools.cpp

@@ -250,6 +250,29 @@ std::string vpIoTools::getTempPath()
 #endif
 }
 
+std::string vpIoTools::getDateTime(const std::string &format)
+{
+  std::time_t now;
+  std::time(&now);
+
+  // first try with an on-stack buffer (fast path)
+  char buf[64];
+  size_t written = std::strftime(buf, sizeof(buf), format.c_str(), std::localtime(&now));
+  if (written > 0) {
+    return buf;
+  }
+
+  // now, iterate with an allocated buffer
+  size_t len = sizeof(buf);
+  std::vector<char> v;
+  do {
+    v.resize(len *= 2);
+    written = std::strftime(v.data(), v.size(), format.c_str(), std::localtime(&now));
+  } while (written == 0);
+
+  return std::string(v.data(), written);
+}
+
 /*!
   Sets the base name (prefix) of the experiment files.
 

modules/core/test/tools/io/testBuildInformation.cpp

@@ -49,6 +49,7 @@ int main()
 {
   std::string info = vpIoTools::getBuildInformation();
   std::cout << info << std::endl;
+  std::cout << vpIoTools::getDateTime() << std::endl;
 
   return EXIT_SUCCESS;
 }