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diff --git a/src/VBox/Runtime/r3/posix/time-posix.cpp b/src/VBox/Runtime/r3/posix/time-posix.cpp
new file mode 100644
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+++ b/src/VBox/Runtime/r3/posix/time-posix.cpp
@@ -0,0 +1,89 @@
+/* $Id: time-posix.cpp $ */
+/** @file
+ * IPRT - Time, POSIX.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#define RTTIME_INCL_TIMEVAL
+#include <sys/time.h>
+#include <time.h>
+
+#include <iprt/time.h>
+#include "internal/time.h"
+
+
+DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
+{
+#if defined(CLOCK_MONOTONIC) && !defined(RT_OS_L4) && !defined(RT_OS_OS2)
+    /* check monotonic clock first. */
+    static bool s_fMonoClock = true;
+    if (s_fMonoClock)
+    {
+        struct timespec ts;
+        if (!clock_gettime(CLOCK_MONOTONIC, &ts))
+            return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
+                 + ts.tv_nsec;
+        s_fMonoClock = false;
+    }
+#endif
+
+    /* fallback to gettimeofday(). */
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return (uint64_t)tv.tv_sec  * RT_NS_1SEC_64
+         + (uint64_t)(tv.tv_usec * RT_NS_1US);
+}
+
+
+/**
+ * Gets the current nanosecond timestamp.
+ *
+ * This differs from RTTimeNanoTS in that it will use system APIs and not do any
+ * resolution or performance optimizations.
+ *
+ * @returns nanosecond timestamp.
+ */
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+    return rtTimeGetSystemNanoTS();
+}
+
+
+/**
+ * Gets the current millisecond timestamp.
+ *
+ * This differs from RTTimeNanoTS in that it will use system APIs and not do any
+ * resolution or performance optimizations.
+ *
+ * @returns millisecond timestamp.
+ */
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+    return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+