Convert milliseconds to readable string : Timing « Development « Java Tutorial

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3. Timing

/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
*/

public class Timing {
  public static double round1(double value) {
    return Math.round(value * 10.0) / 10.0;
  }
  
  public static String getElapsedText(long elapsedMillis) {
    if(elapsedMillis < 60000) {
      double unit = round1(elapsedMillis / 1000.0); 
      return unit + (unit == 1 ? " second" : " seconds");
    }
    else if(elapsedMillis < 60000 * 60) {
      double unit = round1(elapsedMillis / 60000.0); 
      return unit + (unit == 1 ? " minute" : " minutes");
    }
    else if(elapsedMillis < 60000 * 60 * 24) {
      double unit = round1(elapsedMillis / (60000.0 * 60)); 
      return unit + (unit == 1 ? " hour" : " hours");
    }
    else {
      double unit = round1(elapsedMillis / (60000.0 * 60 * 24)); 
      return unit + (unit == 1 ? " day" : " days");
    }
  }
}