Java : Given date is within 12 months or not

Question

I have a date string of the form "07-AUG-13".

I want to know whether the given date is within a certain period from the current date or not.

bool 
isItWithin(int period){
    //check if "07-AUG-13" is within a "period" months from now
}

I have so many approach on net but confused. People have used joda, util.calender etc. Can you help me using util.Calender — VJS, Oct 14 '14 at 08:35
or another hint you could think of date in millis and do arithmetic on it to find if its within 3/6/9 months range. — SMA, Oct 14 '14 at 08:36
possible duplicate of [How to get next month start date and end date if current month is february?](http://stackoverflow.com/questions/23493196/how-to-get-next-month-start-date-and-end-date-if-current-month-is-february). And [this](http://stackoverflow.com/q/10828398/642706) and many others. — Basil Bourque, Oct 14 '14 at 08:36
I have seen this link and trying to understand the ans given by @Juvanis. But didn't get that. if ((year1 * 12 + month1) - (year2 * 12 + month2) > 6) logic — VJS, Oct 14 '14 at 08:38
possible duplicate of [Java Date month difference](http://stackoverflow.com/questions/1086396/java-date-month-difference) — Juru, Oct 14 '14 at 08:45

score 1 · Answer 1 · answered Oct 14 '14 at 08:47

Using the Calendar class:

  public static boolean isWithinMonths(Date startDate, Date endDate, int months) {
    Calendar startCalendar = Calendar.getInstance();
    startCalendar.setTime(startDate);
    Calendar endCalendar = Calendar.getInstance();
    endCalendar.setTime(endDate);

    startCalendar.add(Calendar.MONTH, months);

    return startCalendar.before(endCalendar);
  }

score 0 · Answer 2 · answered Oct 14 '14 at 08:34

0

If you use Java 8 use the new time api.

LocalDate startDate = LocalDate.of(2004, Month.JANUARY, 1);
LocalDate endDate = LocalDate.of(2005, Month.JANUARY, 1);

long monthsInYear2 = ChronoUnit.MONTHS.between(startDate, endDate);

answered Oct 14 '14 at 08:34

Juru

1,623
17
43

1

@vjs I think you'll find that's from java 8, but you could also use JodaTime – MadProgrammer Oct 14 '14 at 08:40
Yes you could use the JodaTime jar, which has similar functionality as above. Java 8 adopted date management as in JodaTime. – Juru Oct 14 '14 at 08:42
Flagging this question as duplicate of Java Date month difference – Juru Oct 14 '14 at 08:45

score -2 · Answer 3 · answered Oct 14 '14 at 08:48

-2

i recommend you to use [Joda Time Library] instead of JDK<8 [Joda...]

or you can try this stuff:

long diff = date1.getTime() - date2.getTime();
long monthDiff=Math.ceil((diff / (60 * 60 * 24)));

answered Oct 14 '14 at 08:48

FaheemFayaz

43
8

Java : Given date is within 12 months or not

3 Answers3