Fix race condition in LocalTimeDate()

source/adios2/helper/adiosSystem.cpp

@@ -10,7 +10,9 @@
 #include "adiosSystem.h"
 #include <chrono> //system_clock, now
 #include <ctime>
+#include <iomanip>
 #include <iostream>  //std::cerr
+#include <sstream>
 #include <stdexcept> // std::runtime_error, std::exception
 #include <system_error>
 
@@ -48,10 +50,20 @@ bool IsLittleEndian() noexcept
 
 std::string LocalTimeDate() noexcept
 {
+    struct tm now_tm;
+    std::ostringstream sout;
+
     std::time_t now =
         std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
 
-    return std::string(ctime(&now));
+#ifdef _WIN32
+    localtime_s(&now_tm, &now);
+#else
+    localtime_r(&now, &now_tm);
+#endif
+    sout << std::put_time(&now_tm, "%a %b %d %H:%M:%S %Y\n");
+
+    return sout.str();
 }
 
 bool IsRowMajor(const std::string hostLanguage) noexcept