判断某日期和今天的差值

public static long getSkewDaysByDate(String time){
        long days = 0;
        try {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            format.setLenient(false);
            Date time2 = format.parse(time);
            Date nowTime = new Date();
            days = gapDays(time2.getTime(), nowTime.getTime());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return days;
    }
    
    private final static long gapDays(long lastTime, long nowTime) {
        long days = (long) ((nowTime + (8 * 3600000)) / (24 * 3600000) - (lastTime + (8 * 3600000)) / (24 * 3600000));
        return days;
    }
    
    public static void main(String[] args) {
        long days = getSkewDaysByDate("2018-07-23 14:07:54");
        System.out.println(days);
    }