Format duration as hrs, mins, sec in Java

/*  w w w.  j  a  v  a  2 s.co  m*/
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 * 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.
 */

import java.text.DecimalFormat;

public class Main {

  final public static char COMMA = ',';
  final public static String COMMA_STR = ",";
  final public static char ESCAPE_CHAR = '\\';
  private static DecimalFormat oneDecimal = new DecimalFormat("0.0");

  /**
   * 
   * Given a finish and start time in long milliseconds, returns a String in the
   * format Xhrs, Ymins, Z sec, for the time difference between two times. If
   * finish time comes before start time then negative valeus of X, Y and Z wil
   * return.
   * 
   * @param finishTime
   *          finish time
   * @param startTime
   *          start time
   */
  public static String formatTimeDiff(long finishTime, long startTime) {
    StringBuffer buf = new StringBuffer();

    long timeDiff = finishTime - startTime;
    long hours = timeDiff / (60 * 60 * 1000);
    long rem = (timeDiff % (60 * 60 * 1000));
    long minutes = rem / (60 * 1000);
    rem = rem % (60 * 1000);
    long seconds = rem / 1000;

    if (hours != 0) {
      buf.append(hours);
      buf.append("hrs, ");
    }
    if (minutes != 0) {
      buf.append(minutes);
      buf.append("mins, ");
    }
    // return "0sec if no difference
    buf.append(seconds);
    buf.append("sec");
    return buf.toString();
  }

  public static void main(String[] argv) {
    System.out.println(formatTimeDiff(12312312312312L, 12312312312L));
  }
}