Java tutorial
/* * Copyright (c) Facebook, Inc. and its affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ package com.facebook.react.common; /** * Detour for System.currentTimeMillis and System.nanoTime calls so that they can be mocked out in * tests. */ public class SystemClock { public static long currentTimeMillis() { return System.currentTimeMillis(); } public static long nanoTime() { return System.nanoTime(); } public static long uptimeMillis() { return android.os.SystemClock.uptimeMillis(); } }