timestamp for file creation

mission/utility/Timestamp.cpp

@@ -0,0 +1,19 @@
+#include "Timestamp.h"
+#include "fsfw/serviceinterface/ServiceInterfacestream.h"
+
+Timestamp::Timestamp() {
+    ReturnValue_t result = Clock::getDateAndTime(&time);
+    if (result != RETURN_OK) {
+        sif::warning << "Timestamp::Timestamp: Failed to get time" << std::endl;
+    }
+}
+
+Timestamp::~Timestamp() {
+}
+
+std::string Timestamp::str() {
+    return std::to_string(time.year) + "-" + std::to_string(time.month) + "-"
+            + std::to_string(time.day) + "--" + std::to_string(time.hour) + "-"
+            + std::to_string(time.minute) + "-" + std::to_string(time.second) + "-";
+}
+