Index: Src/GoogleApis/Apis/Util/IClock.cs
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+/*
+Copyright 2013 Google Inc
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+using System;
+
+namespace Google.Apis.Util
+{
+    /// <summary>Clock wrapper for getting the current time.</summary>
+    public interface IClock
+    {
+        /// <summary>
+        /// Gets a <seealso cref="DateTime"/> object that is set to the current date and time on this computer, 
+        /// expressed as the local time.
+        /// </summary>
+        DateTime Now { get; }
+    }
+
+    /// <summary>A default clock implementation that wraps the <seealso cref="DateTime.Now"/> property.</summary>
+    public class SystemClock : IClock
+    {
+        /// <summary>Constructs a new system clock.</summary>
+        protected SystemClock() { }
+
+        /// <summary>The default instance.</summary>
+        public static readonly IClock Default = new SystemClock();
+
+        public DateTime Now
+        {
+            get { return DateTime.Now; }
+        }
+    }
+}