Java tutorial
//package com.java2s; /** * Title: efa - elektronisches Fahrtenbuch fr Ruderer * Copyright: Copyright (c) 2001-2011 by Nicolas Michael * Website: http://efa.nmichael.de/ * License: GNU General Public License v2 * * @author Nicolas Michael * @version 2 */ public class Main { public static String getHHMMstring(long minutes) { long hh = minutes / 60; long mm = minutes % 60; return hh + ":" + long2String(mm, 2); } public static String long2String(long l, int minDigits) { StringBuilder s = new StringBuilder(minDigits); s.append(Long.toString(l)); while (s.length() < minDigits) { s.insert(0, "0"); } return s.toString(); } }