public static int comparedate(String Date1, String Date2) {
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date data1 = df.parse(Date1);
            Date data2 = df.parse(Date2);
            if (data1 .getTime()>data2 .getTime()) {
                System.out
 
.println("Date1在Date2後");
                return 1;
            } else if (data1.getTime()<data2.getTime()){
                System.out.println("Date1在Date2前");
                return -1;
            } else {
                System.out.println("Date1與Date2相等");
                return 0;
            }
        } catch
 
 (Exception exception) {
            exception.printStackTrace();
        }
        return 0;
    }