判断是不是同一天，同一周

	public static boolean isSameWeek(long a, long b){
		Calendar ca = Calendar.getInstance();
		ca.setTimeInMillis(a);
		Calendar cb = Calendar.getInstance();
		cb.setTimeInMillis(b);
		
		if(ca.get(Calendar.YEAR) != cb.get(Calendar.YEAR)){
			return false;
		}
		return ca.get(Calendar.WEEK_OF_YEAR) == cb.get(Calendar.WEEK_OF_YEAR);
	}
	/**
	 * 汉语习惯周日为一周的最后一天
	 * @param time0
	 * @param time1
	 * @return
	 */
	public static boolean isSameSinoWeek(long time0, long time1){
		Calendar ca = Calendar.getInstance();
		ca.setTimeInMillis(time0);
		ca.add(Calendar.DAY_OF_YEAR, -1);
		Calendar cb = Calendar.getInstance();
		cb.setTimeInMillis(time1);
		cb.add(Calendar.DAY_OF_YEAR, -1);
		if(ca.get(Calendar.YEAR) != cb.get(Calendar.YEAR)){
			return false;
		}
		return ca.get(Calendar.WEEK_OF_YEAR) == cb.get(Calendar.WEEK_OF_YEAR);
	}
	public static boolean isSameDay(long ta, long tb) {
		return formatTime(ta, "yyyyMMdd").equals(formatTime(tb, "yyyyMMdd"));
	}
	public static String formatTime(long timestamp, String pattern) {
		SimpleDateFormat format = new SimpleDateFormat(pattern);
		return format.format(new Date(timestamp));
	}
	public static long parseAndGetTime(String s, String pattern) throws ParseException {
		SimpleDateFormat format = new SimpleDateFormat(pattern);
		return format.parse(s).getTime();
	}