--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/core/RubyTime.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.runtime.core;
+
+import java.text.*;
+import java.util.*;
+
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+/**
+ * Represents the Ruby {@code Time} class. This is a very rough implementation and is only really
+ * enough to run benchmark harnesses.
+ */
+public class RubyTime extends RubyObject {
+
+    /**
+     * The class from which we create the object that is {@code Time}. A subclass of
+     * {@link RubyClass} so that we can override {@link #newInstance} and allocate a
+     * {@link RubyTime} rather than a normal {@link RubyBasicObject}.
+     */
+    public static class RubyTimeClass extends RubyClass {
+
+        public RubyTimeClass(RubyClass objectClass) {
+            super(null, objectClass, "Time");
+        }
+
+        @Override
+        public RubyBasicObject newInstance() {
+            return new RubyTime(this, milisecondsToNanoseconds(System.currentTimeMillis()));
+        }
+
+    }
+
+    private final long nanoseconds;
+
+    public RubyTime(RubyClass timeClass, long nanoseconds) {
+        super(timeClass);
+        this.nanoseconds = nanoseconds;
+    }
+
+    /**
+     * Subtract one time from another, producing duration in seconds.
+     */
+    public double subtract(RubyTime other) {
+        return nanosecondsToSecond(nanoseconds - other.nanoseconds);
+    }
+
+    @Override
+    public String toString() {
+        /*
+         * I think this is ISO 8601 with a custom time part. Note that Ruby's time formatting syntax
+         * is different to Java's.
+         */
+
+        return new SimpleDateFormat("Y-MM-d H:m:ss Z").format(toDate());
+    }
+
+    private Date toDate() {
+        return new Date(nanosecondsToMiliseconds(nanoseconds));
+    }
+
+    public static RubyTime fromDate(RubyClass timeClass, long timeMiliseconds) {
+        return new RubyTime(timeClass, milisecondsToNanoseconds(timeMiliseconds));
+    }
+
+    private static long milisecondsToNanoseconds(long miliseconds) {
+        return miliseconds * 1000000;
+    }
+
+    private static long nanosecondsToMiliseconds(long nanoseconds) {
+        return nanoseconds / 1000000;
+    }
+
+    private static double nanosecondsToSecond(long nanoseconds) {
+        return nanoseconds / 1e9;
+    }
+
+}