Import code from internal repository to git

java/com/google/domain/registry/util/SystemClock.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.
+
+package com.google.domain.registry.util;
+
+import static org.joda.time.DateTimeZone.UTC;
+
+import dagger.Module;
+import dagger.Provides;
+
+import org.joda.time.DateTime;
+
+import javax.annotation.concurrent.ThreadSafe;
+
+/** Clock implementation that proxies to the real system clock. */
+@ThreadSafe
+public class SystemClock implements Clock {
+
+  /** Returns the current time. */
+  @Override
+  public DateTime nowUtc() {
+    return DateTime.now(UTC);
+  }
+
+  /** Dagger module for {@link SystemClock}. */
+  @Module
+  public static final class SystemClockModule {
+    private static final Clock clock = new SystemClock();
+
+    @Provides
+    static Clock provideClock() {
+      return clock;
+    }
+  }
+}