--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/utilities/jfrTimeConverter.hpp	2018-04-09 15:24:41.439334309 +0200
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP
+#define SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class JfrTimeConverter : AllStatic {
+ private:
+  static double counter_to_nano_multiplier(bool is_os_time = false);
+  static double counter_to_nanos_internal(jlong c, bool is_os_time = false);
+  static double counter_to_millis_internal(jlong c, bool is_os_time = false);
+  static void initialize();
+
+ public:
+  static const double NANOS_PER_SEC;
+  static const double NANOS_PER_MILLISEC;
+  static const double NANOS_PER_MICROSEC;
+
+  // factors
+  static double nano_to_counter_multiplier(bool is_os_time = false);
+  // ticks to nanos
+  static jlong counter_to_nanos(jlong c, bool is_os_time = false);
+  // ticks to millis
+  static jlong counter_to_millis(jlong c, bool is_os_time = false);
+  // nanos to ticks
+  static jlong nanos_to_countertime(jlong c, bool as_os_time = false);
+};
+
+#endif // SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP