How to get total number of months from a specific Date?

Question

I am new to Android.I have a requirement, I have a field to enter the Date Of Birth of a person.On successful selection I wanna return the total number of months from the DOB to current date.For example, if I entered DOB as 19/10/2012 I wanna return 36(months).I searched for this, but didn't find anything suitable to my requirement.Here is my current code which return sucessful data,

private void showDate(int year, int month, int day) {

    Calendar cal = Calendar.getInstance();
    cal.setTimeInMillis(0);
    cal.set(year, month, day);
    Date date = cal.getTime();
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

    if(System.currentTimeMillis() > date.getTime()) {
        edtDate.setText(sdf.format(date));
        LocalDate date1 = new LocalDate(date);
        LocalDate date2 = new LocalDate(new java.util.Date());
        PeriodType monthDay = PeriodType.yearMonthDayTime();
        Period difference = new Period(date1, date2, monthDay);
        int months = difference.getMonths();
        months=months + 1;
        System.out.println("16102015:Nunber of Months"+months);
    }else{
        Toast.makeText(mActivity,getResources().getString(R.string.date_validationmsg),Toast.LENGTH_LONG).show();
    }


}

@robodev i wanna get total number of months from a date i selected? — Noufal M, Oct 19 '15 at 05:23
oke, check my answer pass two dates to the function if you are not interested to use JodaTime — droidev, Oct 19 '15 at 05:26

score 5 · Accepted Answer · answered Oct 19 '15 at 05:21

5

Calendar startCalendar = new GregorianCalendar();
startCalendar.setTime(startDate);
Calendar endCalendar = new GregorianCalendar();
endCalendar.setTime(endDate);

int diffYear = endCalendar.get(Calendar.YEAR) - startCalendar.get(Calendar.YEAR);
int diffMonth = diffYear * 12 + endCalendar.get(Calendar.MONTH) - startCalendar.get(Calendar.MONTH);

answered Oct 19 '15 at 05:21

Arijit Mukherjee

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how to set current date as endDate using GregorianCalendar – Noufal M Oct 19 '15 at 05:58
you can simply use your java date as well – Arijit Mukherjee Oct 19 '15 at 05:59
Thanks it seems getting the output.Voted for your answer.I will verify the answer if it met my requirement – Noufal M Oct 19 '15 at 06:06
i want to be add specific number of months to the DOB and show that exact date -DAY,MONTH, an YEAR.If i have a date 20/02/2014and i add 3 months i have to show 20 MAY 2014. can you help on this? – Noufal M Oct 19 '15 at 07:53
calender.add(Calendar.MONTH, 1); – Arijit Mukherjee Oct 19 '15 at 08:31
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/92724/discussion-between-noufal-m-and-arijit-mukherjee). – Noufal M Oct 19 '15 at 12:14

score 3 · Answer 2 · edited May 23 '17 at 10:27

3

To start with, I'd suggest using LocalDate instead of DateTime for the computations. Ideally, don't use java.util.Date at all, and take your input as LocalDate to start with (e.g. by parsing text straight to that, or wherever your data comes from.) Set the day of month to 1 in both dates, and then take the difference in months:

private static int monthsBetweenDates(LocalDate start, LocalDate end) {
    start = start.withDayOfMonth(1);
    end = end.withDayOfMonth(1);
    return Months.monthsBetween(start, end).getMonths();
}

UPDATE 1

see this link the OP is accepted the same answer because Months.monthsBetween() method is not working proper for him

UPDATE 2

LocalDate userEnteredDate = LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(date));    
LocaleDate currentDate =  LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(new Date()));

int months = monthsBetweenDates(userEnteredDate, currentDate)

edited May 23 '17 at 10:27

Community

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answered Oct 19 '15 at 05:25

droidev

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Can you suggest the input.Mine is as shown in the above code Date date = cal.getTime(); which is the start date. – Noufal M Oct 19 '15 at 05:50
@NoufalM have you checked the answer ? – droidev Oct 19 '15 at 06:18
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/92693/discussion-between-robo-dev-and-noufal-m). – droidev Oct 19 '15 at 07:23

score 1 · Answer 3 · answered Oct 19 '15 at 07:12

Using Joda-time library here, I was able to get the desired result. Try the below code it would give the desired the difference in months.

    DateTime date1 = new DateTime().withDate(2012, 10, 19);
    DateTime today = new DateTime().withDate(2015, 10, 19);
    // calculate month difference
    int diffMonths = Months.monthsBetween(date1.withDayOfMonth(1), today.withDayOfMonth(1)).getMonths();

score 0 · Answer 4 · answered Oct 19 '15 at 05:21

0

Using JodaTime, it's really easy:

http://www.joda.org/joda-time/apidocs/

int nMonths = new Period(startTime, endTime).getMonths();

answered Oct 19 '15 at 05:21

paulsm4

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I am getting 0 as the output – Noufal M Oct 19 '15 at 05:57

score 0 · Answer 5 · answered Oct 19 '15 at 05:28

0

Use this code to calculate months between two dates

public static int monthsBetweenUsingJoda(Date d1, Date d2) {
    return Months.monthsBetween(new LocalDate(d1.getTime()), new LocalDate(d2.getTime())).getMonths();
}

answered Oct 19 '15 at 05:28

waleedsarwar86

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How to get total number of months from a specific Date?

5 Answers5