Java时间操作工具类

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package com.hh.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * 时间工具类，该类的出现是为了替换DateUtil混乱的方法签名。 在本类的工具方法中，凡涉及到时间的本地化表现形式时，都用String格式。</br>
 * 凡涉及到子<b>1970-01-01 08:00:00</b> 至某个时间的值时，都用long来表示</br>
 * 
 * 本类提供的方法都是依照中国<b>GTM+08:00</b>的时区来计算。</br> 所有的本地化都是按照简体中文 “zh” 来计算。</br>
 * 
 * <p>
 * 请注意：获取的当前毫秒值因为操作系统的原因，都有误差！而且在间隔很小的时间段内（大约十几毫秒，根据操作系统的不用而不同）获取到的
 * 毫秒值可能相同，可以理解为不同操作系统的最小时间单位为十几毫秒。
 * </p>
 * @version 1.0
 * @author lixunhui@qq.com
 * @since JDK 1.6
 **/
public class DateTools {

	// 日期式样，年月日，用横杠离开，例如：2006-12-25，2008-08-08
	private static final String YYYY_MM_DD = "yyyy-MM-dd";
	// 日期式样时分秒，时分秒用冒号离开，
	private static final String HH_MI_SS = "HH:mm:ss";
	// 日期式样，年月日时分秒，年月日用横杠离开，时分秒用冒号离开，
	private static final String YYYY_MM_DD_HH_MI_SS = "yyyy-MM-dd HH:mm:ss";
	// 中国时区
	private static TimeZone zone = TimeZone.getTimeZone("GMT+08:00");
	// 中国国家语言格式
	private static Locale locale = Locale.CHINESE;
	private static final SimpleDateFormat FORMAT_YYYY_MM_DD = new SimpleDateFormat(YYYY_MM_DD);
	private static final SimpleDateFormat FORMAT_HH_MI_SS = new SimpleDateFormat(HH_MI_SS);
	private static final SimpleDateFormat FORMAT_YYYY_MM_DD_HH_MI_SS = new SimpleDateFormat(YYYY_MM_DD_HH_MI_SS);

	private static final int YEAR = 24 * 60 * 60 * 365;
	private static final int MONTH = 24 * 60 * 60 * 30;
	private static final int DAY = 24 * 60 * 60;
	private static final int HOUR = 60 * 60;
	private static final int MINUTE = 60;

	public static void main(String[] args) {
		/**
		 * String preMonthFirstDayDate = getPreMonthFirstDayDate();
		 * System.out.println("preMonthFirstDayDate:" + preMonthFirstDayDate);
		 * long preMonthFirstDayInMillis = getPreMonthFirstDayInMillis();
		 * System.out.println("preMonthFirstDayInMillis:" +
		 * preMonthFirstDayInMillis); long preMonthFirstDayInSeconds =
		 * getPreMonthFirstDayInSeconds();
		 * System.out.println("preMonthFirstDayInSeconds:" +
		 * preMonthFirstDayInSeconds); String preMonthFirstDayTime =
		 * getPreMonthFirstDayTime(); System.out.println("preMonthFirstDayTime:"
		 * + preMonthFirstDayTime); String preMonthLastDayDate =
		 * getPreMonthLastDayDate(); System.out.println("preMonthLastDayDate:" +
		 * preMonthLastDayDate); long preMonthLastDayInMillis =
		 * getPreMonthLastDayInMillis();
		 * System.out.println("preMonthLastDayInMillis:" +
		 * preMonthLastDayInMillis); long preMonthLastDayInSeconds =
		 * getPreMonthLastDayInSeconds();
		 * System.out.println("preMonthLastDayInSeconds:" +
		 * preMonthLastDayInSeconds); String preMonthLastDayTime =
		 * getPreMonthLastDayTime(); System.out.println("preMonthLastDayTime:" +
		 * preMonthLastDayTime);
		 **/

		/**
		 * String currMonthFirstDayDate = getCurrMonthFirstDayDate();
		 * System.out.println("currMonthFirstDayDate:" + currMonthFirstDayDate);
		 * long currMonthFirstDayInMillis = getCurrMonthFirstDayInMillis();
		 * System.out.println("currMonthFirstDayInMillis:" +
		 * currMonthFirstDayInMillis); long currMonthFirstDayInSeconds =
		 * getCurrMonthFirstDayInSeconds();
		 * System.out.println("currMonthFirstDayInSeconds:" +
		 * currMonthFirstDayInSeconds); String currMonthFirstDayTime =
		 * getCurrMonthFirstDayTime();
		 * System.out.println("currMonthFirstDayTime:" + currMonthFirstDayTime);
		 * long preMonthLastDayInSeconds = getPreMonthLastDayInSeconds();
		 * System.out.println("preMonthLastDayInSeconds:" +
		 * preMonthLastDayInSeconds); long preMonthLastDayInMillis =
		 * getPreMonthLastDayInMillis();
		 * System.out.println("preMonthLastDayInMillis:" +
		 * preMonthLastDayInMillis);
		 **/

		/**
		 * String currYearFirstDayDate = getCurrYearFirstDayDate();
		 * System.out.println("currYearFirstDayDate:" + currYearFirstDayDate);
		 * String preYearFirstDayDate = getPreYearFirstDayDate();
		 * System.out.println("preYearFirstDayDate:" + preYearFirstDayDate);
		 * long preYearFirstDayInMillis = getPreYearFirstDayInMillis();
		 * System.out.println("preYearFirstDayInMillis:" +
		 * preYearFirstDayInMillis); long preYearFirstDayInSeconds =
		 * getPreYearFirstDayInSeconds();
		 * System.out.println("preYearFirstDayInSeconds:"
		 * +preYearFirstDayInSeconds); String preYearFirstDayTime =
		 * getPreYearFirstDayTime(); System.out.println("preYearFirstDayTime:" +
		 * preYearFirstDayTime); String preYearLastDayDate =
		 * getPreYearLastDayDate(); System.out.println("preYearLastDayDate:" +
		 * preYearLastDayDate); long preYearLastDayInMillis =
		 * getPreYearLastDayInMillis();
		 * System.out.println("preYearLastDayInMillis:" +
		 * preYearLastDayInMillis); long preYearLastDayInSeconds =
		 * getPreYearLastDayInSeconds();
		 * System.out.println("preYearLastDayInSeconds:" +
		 * preYearLastDayInSeconds); String preYearLastDayTime =
		 * getPreYearLastDayTime(); System.out.println("preYearLastDayTime:" +
		 * preYearLastDayTime);
		 **/
		/**
		 * for(int i=0;i<5;i++){ long currMonthFirstDayInMillis =
		 * getPreYearFirstDayInMillis();
		 * System.out.println("currMonthFirstDayInMillis:" +
		 * currMonthFirstDayInMillis); }
		 * 
		 * 
		 * long parseTime2Second = parseTime2Second("2006-01-01 07:59:59"); long
		 * parseTime2Second2 = parseTime2Second("2006-01-01 08:00:00");
		 * System.out.println(parseTime2Second);
		 * System.out.println(parseTime2Second2);
		 **/
		String parseSecond2Days = parseSecond2Days(99999999);
		System.out.println(parseSecond2Days);
	}

	/**
	 * 获取当前时间的本地化表现形式。 如：2012-07-03 18:15:03 yyyy-MM-dd HH:mm:ss
	 * 
	 * @return yyyy-MM-dd HH:mm:ss 本地化表现形式
	 */
	public static String currentTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		Calendar.getInstance(zone, locale);
		Date time = calendar.getTime();
		String format = FORMAT_YYYY_MM_DD_HH_MI_SS.format(time);
		return format;
	}

	/**
	 * 获取当前日期的本地化表现形式,不包含时间。 如：2012-07-03 yyyy-MM-dd
	 * 
	 * @return yyyy-MM-dd 本地化表现形式
	 */
	public static String currentDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		Date time = calendar.getTime();
		String format = FORMAT_YYYY_MM_DD.format(time);
		return format;
	}

	/**
	 * 获取当前时间至1970-01-01 08:00:00 的毫秒值。 如：1341368657874
	 * 
	 * @return long型 毫秒值
	 */
	public static long currentTimeInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		long timeInMillis = calendar.getTimeInMillis();
		return timeInMillis;
	}

	/**
	 * 获取当前时间至1970-01-01 08:00:00 的秒值。 如：1341368867 该方法由毫秒值除以1000获得
	 * 
	 * @return long型 秒值
	 */
	public static long currentTimeInSecond() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		long timeInSecond = calendar.getTimeInMillis() / 1000;
		return timeInSecond;
	}

	/**
	 * @param millis
	 *            距1970-01-01 00:00:00.000的毫秒值
	 * @return yyyy-MM-dd HH:mm:ss 本地化表现形式
	 */
	public static String parseMillis2Time(long millis) {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.setTimeInMillis(millis);
		Date time = calendar.getTime();
		String format = FORMAT_YYYY_MM_DD_HH_MI_SS.format(time);
		return format;
	}

	/**
	 * 
	 * @param second
	 *            距1970-1-1 00:00:00.000的秒值
	 * @return yyyy-MM-dd HH:mm:ss 本地化表现形式
	 * @see String parseMillis2Time(long millis)
	 * @exception RuntimeException
	 *                如果参数不能按照<code>yyyy-MM-dd HH:mm:ss</code>
	 *                格式解析，会抛出RuntimeException
	 */
	public static String parseSecond2Time(long second) {
		return parseMillis2Time(second * 1000);
	}

	/**
	 * 
	 * @param time
	 *            "2012-07-04 12:19:34" 必须是 <code>yyyy-MM-dd HH:mm:ss</code> 格式
	 * 
	 * @return long型 秒值
	 * @exception RuntimeException
	 *                如果参数不能按照<code>yyyy-MM-dd HH:mm:ss</code>
	 *                格式解析，会抛出RuntimeException
	 */
	public static long parseTime2Second(String time) {
		if (time == null || time.trim().length() == 0) {
			return 0L;
		}
		Calendar calendar = Calendar.getInstance(zone, locale);
		Date date = null;
		try {
			date = FORMAT_YYYY_MM_DD_HH_MI_SS.parse(time);
		} catch (ParseException e) {
			e.printStackTrace();
			throw new RuntimeException("日期时间格式解析错误，请检查格式是否正确", e);
		}
		calendar.setTime(date);
		return calendar.getTimeInMillis() / 1000;
	}

	/**
	 * 获取今天在 <code>00:00:00</code> 的日期和时间本地化表现形式
	 * 
	 * @return <code>yyyy-MM-dd HH:mm:ss</code> 本地化表现形式
	 */
	public static String getTodayStartTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		String format = FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
		return format;
	}

	/**
	 * 获取今天在 <code>00:00:00</code> 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long型 毫秒值
	 */
	public static long getTodayStartTimeInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取今天在 <code>00:00:00</code> 至 1970-01-01 08:00:00 的秒值</br>
	 * 
	 * @return long型 秒值
	 * @see long getTodayStartTimeInMillis()
	 */
	public static long getTodayStartTimeInSeconds() {
		return getTodayStartTimeInMillis() / 1000;
	}

	public static String getTodayEndTimes() {
		return parseMillis2Time(getTodayEndTimeInMillis());
	}

	/**
	 * 获取今天在23:59:59 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-04 23:59:59 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long型 秒值
	 */
	public static long getTodayEndTimeInSeconds() {
		return getTodayEndTimeInMillis() / 1000;
	}

	/**
	 * 获取今天在凌晨23:59:59 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-04 23:59:59 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long型 毫秒值
	 */
	public static long getTodayEndTimeInMillis() {
		Calendar todayEnd = Calendar.getInstance(zone, locale);
		todayEnd.set(Calendar.HOUR, 23);
		todayEnd.set(Calendar.MINUTE, 59);
		todayEnd.set(Calendar.SECOND, 59);
		todayEnd.set(Calendar.MILLISECOND, 999);
		Date date = todayEnd.getTime();
		return date.getTime();
	}

	/**
	 * 获取 自 昨天00:00:00.000 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-03 00:00:00 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long型 毫秒值
	 */
	public static long getYesterdayStartTimeInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取 自 昨天00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-03 00:00:00 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long型 秒值
	 */
	public static long getYesterdayStartTimeInSeconds() {
		return getYesterdayStartTimeInMillis() / 1000;
	}

	/**
	 * 获取昨天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式 假如今天是2012-07-04，则返回
	 * 2012-07-03 00:00:00
	 * 
	 * @return 昨天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式
	 */
	public static String getYesterdayStartTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取昨天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br> 假如今天是2012-07-04，则返回
	 * 2012-07-03
	 * 
	 * @return 获取昨天按照 <code>yyyy-MM-dd</code> 本地化表现形式
	 */
	public static String getYesterdayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取昨天在午夜23:59:59 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-03 23:59:59 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long型 毫秒值
	 */
	public static long getYesterdayEndTimeInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取昨天在午夜23:59:59 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-03 23:59:59 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long型 秒值
	 */
	public static long getYesterdayEndTimeInSeconds() {
		return getYesterdayEndTimeInMillis();
	}

	/**
	 * 获取上个月第一天的按照 <code>yyyy-MM-01 00:00:00</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-06-01 00:00:00
	 * 
	 * @return 获取上个月第一天的按照 <code>yyyy-MM-01 00:00:00</code> 本地化表现形式</br>
	 */
	public static String getPreMonthFirstDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.add(Calendar.MONTH, -1);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取上个月第一天的按照 <code>yyyy-MM-01</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-06-01
	 * 
	 * @return 获取上个月第一天的按照 <code>yyyy-MM-01</code> 本地化表现形式</br>
	 */
	public static String getPreMonthFirstDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.add(Calendar.MONTH, -1);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取上个月第一天的00:00:00 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-06-30 00:00:00 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getPreMonthFirstDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.add(Calendar.MONTH, -1);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取上个月第一天的00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-06-30 00:00:00 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 秒值
	 */
	public static long getPreMonthFirstDayInSeconds() {
		return getPreMonthFirstDayInMillis() / 1000;
	}

	/**
	 * 获取上个月最后一天的按照 <code>yyyy-MM-dd 23:59:59</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-06-30 23:59:59
	 * 
	 * @return 获取上个月最后一天的按照 <code>yyyy-MM-dd 23:59:59</code> 本地化表现形式</br>
	 */
	public static String getPreMonthLastDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取上个月最后一天的按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-06-30
	 * 
	 * @return 获取上个月最后一天的按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 */
	public static String getPreMonthLastDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取上个月最后一天的23:59:59 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-06-30 23:59:59 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getPreMonthLastDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取上个月最后一天的23:59:59 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-06-30 23:59:59 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 秒值
	 */
	public static long getPreMonthLastDayInSeconds() {
		return getPreMonthLastDayInMillis() / 1000;
	}

	/**
	 * 获取当前月第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-07-01 00:00:00
	 * 
	 * @return 获取当前月第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 */
	public static String getCurrMonthFirstDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取当前月第一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-07-01
	 * 
	 * @return 获取当前月第一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 */
	public static String getCurrMonthFirstDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取当前月第一天的00:00:00 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-01 00:00:00 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getCurrMonthFirstDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(Calendar.DAY_OF_MONTH, 1);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取当前月第一天的00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-07-01 00:00:00 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getCurrMonthFirstDayInSeconds() {
		return getCurrMonthFirstDayInMillis() / 1000;
	}

	/**
	 * 获取今年第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-01-01
	 * 
	 * @return 获取今年第一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 */
	public static String getCurrYearFirstDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(calendar.get(Calendar.YEAR), Calendar.JANUARY, 1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取今年第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2012-01-01 00:00:00
	 * 
	 * @return 获取今年第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 */
	public static String getCurrYearFirstDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(calendar.get(Calendar.YEAR), Calendar.JANUARY, 1, 0, 0, 0);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取今年第一天的00:00:00 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-01-01 00:00:00 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getCurrYearFirstDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set(calendar.get(Calendar.YEAR), Calendar.JANUARY, 1, 0, 0, 0);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取今年第一天的00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2012-01-01 00:00:00 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getCurrYearFirstDayInSeconds() {
		return getCurrYearFirstDayInMillis() / 1000;
	}

	/**
	 * 获取去年第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2011-01-01 00:00:00
	 * 
	 * @return 获取今年第一天按照 <code>yyyy-MM-dd 00:00:00</code> 本地化表现形式</br>
	 */
	public static String getPreYearFirstDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.JANUARY, 1, 0, 0, 0);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取去年第一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2011-01-01
	 * 
	 * @return 获取今年第一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 */
	public static String getPreYearFirstDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.JANUARY, 1);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取去年第一天的00:00:00 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2011-01-01 00:00:00 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getPreYearFirstDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.JANUARY, 1, 0, 0, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取去年第一天的00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2011-01-01 00:00:00 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 秒值
	 * @see getPreYearFirstDayInMillis()
	 */
	public static long getPreYearFirstDayInSeconds() {
		return getPreYearFirstDayInMillis() / 1000;
	}

	/**
	 * 获取去年最后一天按照 <code>yyyy-MM-dd 23:59:59</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2011-12-31 23:59:59
	 * 
	 * @return 获取去年最后一天按照 <code>yyyy-MM-dd 23:59:59</code> 本地化表现形式</br>
	 */
	public static String getPreYearLastDayTime() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.DECEMBER, 31, 23, 59, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD_HH_MI_SS.format(date);
	}

	/**
	 * 获取去年最后一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 * 假如今天是2012-07-04，则返回2011-12-31
	 * 
	 * @return 获取去年最后一天按照 <code>yyyy-MM-dd</code> 本地化表现形式</br>
	 */
	public static String getPreYearLastDayDate() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.DECEMBER, 31);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return FORMAT_YYYY_MM_DD.format(date);
	}

	/**
	 * 获取去年最后一天的00:00:00 至 1970-01-01 08:00:00 的毫秒值</br> 假如今天是 2012-07-04，则返回
	 * 2011-12-31 23:59:59 至 1970-01-01 08:00:00 的毫秒值
	 * 
	 * @return long 毫秒值
	 */
	public static long getPreYearLastDayInMillis() {
		Calendar calendar = Calendar.getInstance(zone, locale);
		calendar.set((calendar.get(Calendar.YEAR)) - 1, Calendar.DECEMBER, 31, 23, 59, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		Date date = calendar.getTime();
		return date.getTime();
	}

	/**
	 * 获取去年最后一天的00:00:00 至 1970-01-01 08:00:00 的秒值</br> 假如今天是 2012-07-04，则返回
	 * 2011-12-31 23:59:59 至 1970-01-01 08:00:00 的秒值
	 * 
	 * @return long 秒值
	 * @see getPreYearLastDayInMillis()
	 */
	public static long getPreYearLastDayInSeconds() {
		return getPreYearLastDayInMillis() / 1000;
	}

	/**
	 * 将 秒 换算成 X年X月X天
	 * 
	 * @param second
	 * @return
	 */
	public static String parseSecond2Days(int second) {
		int year = second / YEAR;
		int year_remainder = second % YEAR;

		int month = year_remainder / MONTH;
		int month_remainder = year_remainder % MONTH;

		int day = month_remainder / DAY;

		if (year == 0) {
			if (month == 0) {
				return day + "天";
			} else {
				return month + "月" + day + "天";
			}
		} else {
			return year + "年" + month + "月" + day + "天";
		}
	}
}

转载于:https://my.oschina.net/huiger/blog/161740