Here you can find the source of formatMillis(long duration)
public static String formatMillis(long duration)
//package com.java2s; /*//from w ww .j a v a2 s. com * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ public class Main { public static String formatMillis(long duration) { duration = Math.abs(duration); StringBuilder sb = new StringBuilder(); int secs = (int) (duration / 1000) % 60; int mins = (int) ((duration / (1000 * 60)) % 60); int hrs = (int) ((duration / (1000 * 60 * 60)) % 24); int days = (int) ((duration / (1000 * 60 * 60 * 24)) % 7); //sb.append(millis + " milliseconds"); addUnitString(sb, days, "day"); addUnitString(sb, hrs, "hour"); addUnitString(sb, mins, "minute"); addUnitString(sb, secs, "second"); if (duration < 1000) { addUnitString(sb, duration, "millisecond"); } return sb.toString(); } private static void addUnitString(StringBuilder sb, long unit, String unitString) { //only add unit if >= 1 if (unit == 1) { addComma(sb); sb.append("1 "); sb.append(unitString); } else if (unit > 1) { addComma(sb); sb.append(unit); sb.append(" "); sb.append(unitString); sb.append("s"); } } private static void addComma(StringBuilder sb) { if (sb.length() > 0) { sb.append(", "); } } }