java Date

1. 设置时间

        //
        Calendar cStart = Calendar.getInstance();
        cStart.set(cStart.get(Calendar.YEAR), cStart.get(Calendar.MONTH), cStart.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
　　　　　　注意set方法的month是0-11
        //
        Calendar cEnd = Calendar.getInstance();
        cEnd.set(cEnd.get(Calendar.YEAR), cEnd.get(Calendar.MONTH), cEnd.get(Calendar.DAY_OF_MONTH), 23, 0, 0);

2. 时间格式化

    public static String getDateFormat(Date date) {
        
        SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//注意HH表示24小时制
        return s.format(date);
        
    }