joda datetime记录

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        //获取X时间前 minusDays/minusHours/minusMillis...
		DateTime.now().minusDays(15).toDate();
	
		//获取X时间后 plusDays/plusHours/plusMillis
		DateTime.now().plusDays(15).toDate();
	
	 	/**
	     * 获取DateTime今日零点
	     *
	     * @return
	     */
	    public static Date getStartOfToday(DateTime dateTime) {
	        return dateTime.withMillisOfDay(0).toDate();
	    }
	
	    /**
	     * 获取DateTime昨日零点
	     *
	     * @return
	     */
	    public static Date getStartOfYesterday(DateTime dateTime) {
	        return dateTime.plusDays(-1).withMillisOfDay(0).toDate();
	    }
	
	    /**
	     * 获取上周一零点
	     *
	     * @param dateTime
	     * @return
	     */
	    public static Date getLastMonday(DateTime dateTime) {
	        return dateTime.minusWeeks(1)
	                .withDayOfWeek(1)
	                .withTimeAtStartOfDay()
	                .toDate();
	    }
	
	    /**
	     * 获取上周日零点
	     *
	     * @param dateTime
	     * @return
	     */
	    public static Date getLastSunday(DateTime dateTime) {
	        return dateTime
	                .minusDays(dateTime.getDayOfWeek())
	                .withTime(23, 59, 59, 0)
	                .toDate();
	    }
	
		/**
	     * 获取上月一号零点
	     * @param dateTime
	     * @return
	     */
	    public static Date getLastMonthStratTime(DateTime dateTime) {
	        return dateTime.minusMonths(1)
	                .withDayOfMonth(1)
	                .withTimeAtStartOfDay().toDate();
	    }
	
	    /**
	     * 获取上月底零点
	     * @param dateTime
	     * @return
	     */
	    public static Date getLastMonthEndTime(DateTime dateTime) {
	        return dateTime.minusDays(dateTime.getDayOfMonth())
	                .withTime(23, 59, 59, 0).toDate();
	    }
	
		//获取两个DateTime相隔的时间
		int between = new Period(start, end, PeriodType.days()).getDays();
	
		//时间解析
		DateTimeFormatter format = DateTimeFormat .forPattern("yyyy-MM-dd HH:mm:ss"); 
	　　DateTime d = DateTime.parse("2017-10-17 20:06:05",format) ;
	
		//得到某一日期的年与日时分秒
		DateTime time = new DateTime() ;
		time.getYear();
		time.getMonthOfYear();
		time.getDayOfMonth();...