两个日期之间相差的月数

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在网上看了一下别人的解决方法，直接粗暴的获取日期的月份，相减就给出答案，这不是我想要的，因为这个完全没意义：

两个日期跨年了怎么办，如2017-01-02 到2018-12-13相差几个月？ 拿 1减去12吗。。

后面自己实现了一下：

import org.joda.time.DateTime;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import java.util.Calendar;

@RestController
public class Test {
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public void test() {

        DateTime startTime = new DateTime("2017-12-1");
        DateTime endTime = new DateTime("2018-7-29");

        Calendar c1 = Calendar.getInstance();
        Calendar c2 = Calendar.getInstance();

        c1.setTime(startTime.toDate());
        c2.setTime(endTime.toDate());
        int between = 0;


        while ((c1.get(Calendar.YEAR) != c2.get(Calendar.YEAR)) || (c1.get(Calendar.MONTH) != c2.get(Calendar.MONTH)) ) {
            startTime = startTime.plusMonths(1);
            c1.setTime(startTime.toDate());

            between = between + 1;
            System.out.println("startTime" + startTime);
            System.out.println("endTime" + endTime);

            System.out.println(c1.get(Calendar.YEAR) );
            System.out.println(c2.get(Calendar.YEAR));


            System.out.println(c1.get(Calendar.MONTH) );
            System.out.println(c2.get(Calendar.MONTH));
        }
        System.out.println(between); //7
    }