java常用時間格式工具包

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實現代碼：

package com.winste.common.util;

import java.math.BigDecimal;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {
	
	public static String getToday() {
		Calendar cal = Calendar.getInstance();
		Date today = cal.getTime();
		SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
		return fmt.format(today);
	}

	/**
	 * 獲取當前年月日時分秒毫秒
	 * @return
	 */
	public static String getCuurentTimeAndMillisecond() {
		Calendar cal = Calendar.getInstance();
		Date today = cal.getTime();
		SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMddHHmmssSSS");
		return fmt.format(today);
	}

	/**
	 * 獲取當前爲當前年度的週數
	 * @return
	 */
	public static String getCurrentWeek() {
		Calendar cal = Calendar.getInstance();
		Date today = cal.getTime();
		SimpleDateFormat fmt = new SimpleDateFormat("yyyy");
		return fmt.format(today);
	}

	public static String getToday(String format) {
		Date dt = new Date(System.currentTimeMillis());
		return format(dt, format);
	}
	
	public static String format(Date dt, String format) {
		if (dt == null)
			return null;
		SimpleDateFormat fmt = new SimpleDateFormat(format);
		return fmt.format(dt);
	}
	
	public static Date parse(final String dateStr, final String pattern) {
        DateFormat df = new SimpleDateFormat(pattern);
        try {
			return df.parse(dateStr);
		} catch (ParseException e) {
			e.printStackTrace();
			return null;
		}
    }
	
	public static Date parseDate(String dateStr, String format) {
		if (dateStr == null)
			return null;
		try {
			return org.apache.commons.lang.time.DateUtils.parseDate(dateStr, 
			new String[] { format });
		} catch (ParseException e) {
			e.printStackTrace();
			return null;
		}
	}
	
	/**
	 * 得到傳入日期n月後的日期,如果傳入日期爲null，則表示當前日期n月後的日期
	 * @param dt
	 * @return
	 */
	public static Date getAddMonthDate(Date dt, int months) {
		if (dt == null)
			dt = new Date(System.currentTimeMillis());
		Calendar cal = Calendar.getInstance();
		cal.setTime(dt);
		cal.add(Calendar.MONTH, months);
		return cal.getTime();
	}
	
	/**
	 * 得到傳入日期n天后的日期,如果傳入日期爲null，則表示當前日期n天后的日期
	 * @param dt
	 * @param days
	 * @return
	 */
	public static Date getAddDayDate(Date dt, int days) {
		if (dt == null)
			dt = new Date(System.currentTimeMillis());
		Calendar cal = Calendar.getInstance();
		cal.setTime(dt);
		cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH) + days);
//		cal.set(Calendar.HOUR_OF_DAY, 0);
//		cal.set(Calendar.MINUTE, 0);
//		cal.set(Calendar.SECOND, 0);
//		cal.set(Calendar.MILLISECOND, 0);
		return cal.getTime();
	}
	
	/**
	 * 得到兩個時間相差多少天，不足一天算一天
	 *
	 * @param beginDate
	 * @return
	 */
	public static int getDateMargin(Date beginDate, Date endDate) {
		if (endDate == null)
			endDate = new Date();
		final int mOfDay = 1000 * 60 * 60 * 24;
		final long divtime = (endDate.getTime() - beginDate.getTime());
		final long lday = divtime % mOfDay > 0 ? 
		divtime / mOfDay + 1 : divtime / mOfDay;
		return Long.valueOf(lday).intValue();
	}
	
	/**
	 * 得到當前時間和指定時間的小時差,不足一小時按小時算
	 *
	 * @return
	 */
	public static long getHourMargin(Date beginDate, Date endDate) {
		if (endDate == null)
			endDate = new Date();
		long hour = endDate.getTime() - beginDate.getTime();
		hour = hour / (60 * 60 * 1000);
		hour = hour % (60 * 60 * 1000) > 0 ? hour + 1 : hour;
		return hour;
	}
	
	/**
	 * 得到兩個時間相差多少分鐘,不足一分鐘按一分鐘算
	 *
	 * @param beginDate
	 * @param endDate
	 * @return
	 */
	public static int getMinuteMargin(Date beginDate, Date endDate) {
		if (endDate == null)
			endDate = new Date();
		final int mOfMinute = 1000 * 60;
		final long divtime = (endDate.getTime() - beginDate.getTime());
		final long lminute = divtime % mOfMinute > 0 ? 
		divtime / mOfMinute + 1 : divtime / mOfMinute;
		return Long.valueOf(lminute).intValue();
	}
	
	/**
	* 獲取指定時間的那天 00:00:00.000 的時間
	* 
	* @param date
	* @return
	*/
	public static Date dayBegin(final Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		c.set(Calendar.HOUR_OF_DAY, 0);
		c.set(Calendar.MINUTE, 0);
		c.set(Calendar.SECOND, 0);
		c.set(Calendar.MILLISECOND, 0);
		return c.getTime();
	}
	
	/**
	* 獲取指定時間的那天 23:59:59.999 的時間
	* 
	* @param date
	* @return
	*/
	public static Date dayEnd(final Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		c.set(Calendar.HOUR_OF_DAY, 23);
		c.set(Calendar.MINUTE, 59);
		c.set(Calendar.SECOND, 59);
		c.set(Calendar.MILLISECOND, 999);
		return c.getTime();
	}
	
	/***************************************************************************
	 * 根據年月日得到Date類型時間
	 *
	 * @author
	 * @param year
	 * @param month
	 * @param day
	 * @return Date
	 */
	public static Date getTime(Integer year, Integer month, Integer day) {
		Calendar cal = Calendar.getInstance();
		if (year != null)
			cal.set(Calendar.YEAR, year);
		if (month != null)
			cal.set(Calendar.MONTH, month - 1);
		if (day != null)
			cal.set(Calendar.DAY_OF_MONTH, day);
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		return cal.getTime();
	}
	
	/***************************************************************************
	 * 得到傳入日期所在月的開始時間，如果傳入日期爲null，則表示當前日期n天后的日期
	 *
	 * @author
	 * @param dt
	 * @return Date
	 */
	public static Date getMonthBeginTime(Date dt) {
		if (dt == null)
			dt = new Date(System.currentTimeMillis());
		Calendar cal = Calendar.getInstance();
		cal.setTime(dt);
		cal.set(Calendar.DAY_OF_MONTH, 1);
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		return cal.getTime();
	}
	
	/***************************************************************************
	 * 得到傳入日期所在月的結束時間，如果傳入日期爲null，則表示當前日期n天后的日期
	 *
	 * @author
	 * @param dt
	 * @return Date
	 */
	public static Date getMonthEndTime(Date dt) {
		if (dt == null)
			dt = new Date(System.currentTimeMillis());
		Calendar cal = Calendar.getInstance();
		cal.setTime(dt);
		cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + 1);
		cal.set(Calendar.DAY_OF_MONTH, 1);
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, -1);
		return cal.getTime();
	}
	
	/**
	 * 指定日期獲取本週上週 
	 * @param today
	 * @param week week爲推遲的週數，0本週，-1向前推遲一週，1下週，依次類推
	 * @param end true 返回週一 false 返回週日
	 * @return
	 */
	public static Date getDayToWeek(Date today, int week, boolean end) {
		Calendar cal = Calendar.getInstance();
		cal.setFirstDayOfWeek(Calendar.MONDAY);
		cal.setTime(today);
		cal.add(Calendar.DATE, week * 7);
		if (end) {
			cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
			cal.add(Calendar.DAY_OF_MONTH, -1);
		} else {
			cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		}
		return cal.getTime();
	}
	
	/**
	 * 本週上週
	 * @param week week爲推遲的週數，0本週，-1向前推遲一週，1下週，依次類推
	 * @param end  true 返回週一 false 返回週日
	 * @return
	 */
	public static Date getToWeek(int week, boolean end) {
		Calendar cal = Calendar.getInstance();
		cal.setFirstDayOfWeek(Calendar.MONDAY);
		cal.add(Calendar.DATE, week * 7);
		if (end) {
			cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
			cal.add(Calendar.DAY_OF_MONTH, -1);
		} else {
			cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		}
		return cal.getTime();
	}

	/**
	 * 返回兩個時間之間的天數差(直接相減不計小時)
	 * 時間爲"20181231"格式
	 * @return
	 */
	public static Integer subDay (String bigTime, String smallTime) {
		try {
			DateFormat format = new SimpleDateFormat("yyyyMMdd");
			Date time1 = format.parse(bigTime);
			Date time2 = format.parse(smallTime);
			BigDecimal decimal1 = new BigDecimal(time1.getTime());
			BigDecimal decimal2 = new BigDecimal(time2.getTime());
			//86400000 爲一天時間
			return decimal1.subtract(decimal2).divide(new BigDecimal(86400000)).intValue();
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 返回給定時間的小時(0-23)
	 * @return
	 */
	public static Integer getHour(String time) {
		try {
			DateFormat format = new SimpleDateFormat("yyyyMMdd HH");
			Date date = format.parse(time);
			Calendar calendar = Calendar.getInstance();
			calendar.setTime(date);
			return calendar.get(Calendar.HOUR_OF_DAY);
		} catch (ParseException e) {
			e.printStackTrace();
			return null;
		}
	}
}