diff --git a/src/fsfw/globalfunctions/timeSystems.h b/src/fsfw/globalfunctions/timeSystems.h
new file mode 100644
index 00000000..bb03ebd3
--- /dev/null
+++ b/src/fsfw/globalfunctions/timeSystems.h
@@ -0,0 +1,20 @@
+#ifndef FSFW_SRC_FSFW_GLOBALFUNCTIONS_TIMESYSTEMS_H_
+#define FSFW_SRC_FSFW_GLOBALFUNCTIONS_TIMESYSTEMS_H_
+
+#ifdef PLATFORM_WIN
+#include <winsock2.h>
+#else
+#include <sys/time.h>
+#endif
+
+class TimeSystems {
+ public:
+  virtual ~TimeSystems() {}
+
+  static double convertUnixToJD2000(timeval time) {
+    // time = {{s},{us}}
+    return (time.tv_sec / 86400.0) + 2440587.5 - 2451545;
+  }
+};
+
+#endif /* FSFW_SRC_FSFW_GLOBALFUNCTIONS_TIMESYSTEMS_H_ */