日期时间操作实用方法-优快云博客

/**
	 * @Title: startTimeOfDay
	 * @Description: 获取指定时间当天的开始时间
	 * @param date
	 * @return
	 * @author 姬於宏    ji.yuhong@mayi888.com
	 */
	public static Date startTimeOfDay(Date date){
		if(date != null){
			Calendar calendar = Calendar.getInstance();
		    calendar.setTime(date);
		    calendar.set(Calendar.HOUR_OF_DAY, 0);
		    calendar.set(Calendar.MINUTE, 0);
		    calendar.set(Calendar.SECOND, 0);
		    calendar.set(Calendar.MILLISECOND, 0);
		    return calendar.getTime();
		}
		return null;
	}
	
	public static Date endTimeOfDay(Date date){
		if(date == null)
			return null;
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.set(Calendar.HOUR_OF_DAY,23);
	    calendar.set(Calendar.MINUTE,59);
	    calendar.set(Calendar.SECOND,59);
	    calendar.set(Calendar.MILLISECOND,999);
		return calendar.getTime();
	}

	/**
	 * @Description:得到一年中的第几周
	 * @param date
	 * @return
     */
	public static int getWeekOfYear(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setFirstDayOfWeek(Calendar.MONDAY); //第一天是周一
		calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); //第一天是周一
		calendar.setMinimalDaysInFirstWeek(7); //一周至少有7天
		calendar.setTime(date);//现在时间  时间必须放最后边
		return calendar.get(Calendar.WEEK_OF_YEAR);
	}
	/**
	 * 
	 * @Description:得到一年中的第几个月
	 * @return
	 * @author  huang alin
	 */
	public static int getMonthOfYear(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.MONTH)+1;
	}
	
	/**
	 * 
	 * @Description:得到一年中的第几周
	 * @return
	 * @author  huang alin
	 */
	public static int getYear(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.YEAR);
	}
	
	/**
	 * @Title: getYearStartDateTime
	 * @Description: 获取给定时间  所属年的开始时间
	 * @param date
	 * @return
	 */
	public static Date getYearStartDateTime(Date date){
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.set(Calendar.MONTH, 0);
		cal.set(Calendar.DATE, 1);
		
		return startTimeOfDay(cal.getTime());
	}

	/**
	 * 获取一个月的天数
	 * @param year
	 * @param month
	 * @return
	 */
	public static int getDaysByYearMonth(int year, int month) {

		Calendar a = Calendar.getInstance();
		a.set(Calendar.YEAR, year);
		a.set(Calendar.MONTH, month - 1);
		a.set(Calendar.DATE, 1);
		a.roll(Calendar.DATE, -1);
		int maxDate = a.get(Calendar.DATE);
		return maxDate;
	}
	/**
	 *获取当月最后一天的23：59：59
	 */
	public static Date getMonthEndDay(Date time) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(time);
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        calendar.set(Calendar.HOUR_OF_DAY,23);
        calendar.set(Calendar.MINUTE,59);
        calendar.set(Calendar.SECOND,59);
        calendar.set(Calendar.MILLISECOND,0);
		return calendar.getTime();
	}
	/**
	 * 获取当月第一天的0：00：00
	 */
	public static Date getMonthStartDay(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		calendar.set(Calendar.DAY_OF_MONTH,1);
		return startTimeOfDay(calendar.getTime());
	}
	/**
	 * 获取上周第一天的0:00:00
	 */
	public static Date getLastWeekFirstDay(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		calendar.setFirstDayOfWeek(Calendar.MONDAY);
		calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		return new Date(calendar.getTime().getTime()-1000*60*60*24*7);
	}
	/**
	 * 获取上一周最后一天的23：59：59
	 */
	public static Date getLastWeekEndDay(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		calendar.setFirstDayOfWeek(Calendar.MONDAY);
		calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 0);
		return new Date(calendar.getTime().getTime()-1000*60*60*24*7);
	}
	public static Date getLastMonthStartDay(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		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);
		return calendar.getTime();
	}

	/**
	 * 获取上个月最后一天的23：59：59
	 * @param time
	 * @return
	 */
	public static Date getLastMonthEndDay(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		calendar.set(Calendar.DAY_OF_MONTH,0);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 0);
		return calendar.getTime();
	}

	/**
	 * 获取下个月的最后一天的23：59：59
	 * @param time
	 * @return
	 */
	public static Date getAfterMonthEndDay(Date time){
		Calendar calendar=Calendar.getInstance();

		calendar.setTime(time);
		calendar.add(Calendar.MONTH,1);
		calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
		calendar.set(Calendar.HOUR_OF_DAY,23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 0);
		return calendar.getTime();
	}

	/**
	 * 获取前一天的23：59：59
	 * @param time
	 * @return
	 */
	public static Date getUpEndDay(Date time){
		Calendar calendar =Calendar.getInstance();
		calendar.setTime(time);
		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, 0);
		return calendar.getTime();
	}

	/**
	 * 获取前一天的0：00
	 * @param time
	 * @return
	 */
	public static Date getUpStartDay(Date time){
		Calendar calendar =Calendar.getInstance();
		calendar.setTime(time);
		calendar.add(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);
		return  calendar.getTime();
	}

	/**
	 * 获取当前时间的所在月的最大天数
	 * @param time
	 * @return
	 */
	public static int getDaysByCurr(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		int days=calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
		return days;
	}

	/**
	 * 判断当天是否为本月第一天
	 * @param time
	 * @return
	 */
	public static boolean isFirstDayOfMonth(Date time){
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(time);
		int days=calendar.get(Calendar.DAY_OF_MONTH);
		if(days==1){
			return true;
		}else {
			return false;
		}
	}
Date工具类
