Convert a timestamp (= millisecs) to a concise string : Date Time Timestamp « Database SQL JDBC « Java

Convert a timestamp (= millisecs) to a concise string

 * Copyright (c) 2006 Richard Rodgers
 * Licensed 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

//package com.monad.homerun.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

 * TimeUtil is a utility class with static methods to convert times in various
 * formats into other formats

public class TimeUtil {
  private static final int MINS_PER_DAY = 60 * 24;
  private static final long MS_PER_DAY = 1000 * 60 * MINS_PER_DAY;

  private static final int SEC = 1000;
  private static final int MIN = SEC * 60;
  private static final int HOUR = MIN * 60;
  private static final int DAY = HOUR * 24;
  private static final long WEEK = DAY * 7;
  private static final long YEAR = WEEK * 52;

  private static final long[] buckets = { YEAR, WEEK, DAY, HOUR, MIN, SEC };
  private static final String[] bucketNames = { "year", "week", "day",
      "hour", "minute", "second" };

  private static GregorianCalendar statFmtCal = new GregorianCalendar();

  private static final String ts24Pat = "H:mm:ss yy-MM-dd";

   * Convert a timestamp (= millisecs) to a concise string
   * @param timestamp
   *            a date/time in milliseconds
   * @return formatted time
  public static String timeStampFormat(long timestamp) {
    // test for uninitialized time
    if (timestamp == -1L) {
      return "??";
    SimpleDateFormat sdf = new SimpleDateFormat(ts24Pat);
    return sdf.format(new Date(timestamp));



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