1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.adservices.service.measurement.util; 18 19 import java.util.concurrent.TimeUnit; 20 21 /** Utilities for working with timestamps */ 22 public class Time { 23 /** 24 * Given a Unix epoch timestamp in milliseconds, return a new timestamp that is equal to the 25 * start of the day of the given timestamp, in milliseconds. 26 */ roundDownToDay(long timestamp)27 public static long roundDownToDay(long timestamp) { 28 return Math.floorDiv(timestamp, TimeUnit.DAYS.toMillis(1)) * TimeUnit.DAYS.toMillis(1); 29 } 30 } 31