经过的月数计算未给出当前月和日但不同年份的日期的正确结果 [英] Elapsed Months calculation not giving correct result for dates with current month and day but a different year

问题描述

我正在尝试计算自特定日期以来经过的月份，该功能正常工作，虽然它给了我一个月的差异（不到一个月），如果我把今天的日期与过去的不同年份。

I am trying to calculate months elapsed since a particular date, the function works fine albeit it gives me a one months difference (Less than one month) if I put a date of today with a different year of the past.

假设该功能运作良好的所有日期，除了：

Say for all dates the function works well, except:

如果是2014-03-06 （YYYY，MM，DD）今天我将该日期作为2006-03-06处理到该函数，结果缩短了一个月，但如果我明天使用相同的日期，结果就好了。在哪里我错了。下面是代码：

If it is "2014-03-06" (YYYY,MM,DD) today and I process a date as "2006-03-06" to the function, the result is one month shorter, however if I use the same date tomorrow, the result is just fine. WOnder where I am going wrong. Below is the code:

public static int months(String d) {

        SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
        Date d1 = null;
        try {
            d1 = f.parse(d);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //   Date d2 = (getCurrentDate());
        Date d2 = getCurrentDate(); 
        Calendar c1 = Calendar.getInstance();
        c1.setTime(d1);
        Calendar c2 = Calendar.getInstance();
        c2.setTime(d2);
        int diff = 0;
        if (c2.after(c1)) {
            while (c2.after(c1)) {
                c1.add(Calendar.MONTH, 1);
                if (c2.after(c1)) {
                    diff++;
                }
            }
        } else if (c2.before(c1)) {
            while (c2.before(c1)) {
                c1.add(Calendar.MONTH, -1);
                if (c1.before(c2)) {
                    diff--;
                }
            }
        }
        System.out.println(diff);
        return diff;
    }

结果：95个月。

理想情况下它应该是96个月。

请不要考虑函数的静态性质，我已将此代码隔离在另一个项目中以用于测试目的。

Result: 95 months.

Ideally it should be 96 months.

Please dont consider the static nature of functions, I have isolated this code in a different project for test purpose.

这是c1和c2的值：

java.util.GregorianCalendar[time=1141583400000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Kolkata",offset=19800000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2006,MONTH=2,WEEK_OF_YEAR=10,WEEK_OF_MONTH=2,DAY_OF_MONTH=6,DAY_OF_YEAR=65,DAY_OF_WEEK=2,DAY_OF_WEEK_IN_MONTH=1,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=0,SECOND=0,MILLISECOND=0,ZONE_OFFSET=19800000,DST_OFFSET=0] and c2 is: java.util.GregorianCalendar[time=1394044200000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Kolkata",offset=19800000,dstSavings=0,useDaylight=false,transitions=6,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=2,WEEK_OF_YEAR=10,WEEK_OF_MONTH=2,DAY_OF_MONTH=6,DAY_OF_YEAR=65,DAY_OF_WEEK=5,DAY_OF_WEEK_IN_MONTH=1,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=0,SECOND=0,MILLISECOND=0,ZONE_OFFSET=19800000,DST_OFFSET=0]
95

我的错误是getCurrentDate（）：

My bad here is the getCurrentDate():

public static Date getCurrentDate() {
        String DateStr = new SimpleDateFormat("yyyy-MM-dd"/*,
                current*/).format(Calendar.getInstance().getTime());
        //  String DateStr = formattedDate;
        Date date = null;
        try {
            date = new SimpleDateFormat("yyyy-MM-dd"/*, current*/).parse(DateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        java.sql.Date dx = new java.sql.Date(date.getTime());
        return dx;
    }

推荐答案

检查 getCurrentDate（）方法。我用替换了新的Date（），输出为 96 ，如你所说。

Check your getCurrentDate() method. I have replaced with new Date() and output is 96 as you said.

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