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Calculate number of years months and days between two dates in java

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		
Date birth = sdf.parse("2000-01-01");
Date now = new Date(System.currentTimeMillis());
		
Calendar c = Calendar.getInstance();
c.setTimeInMillis(now.getTime() - birth.getTime());
int y = c.get(Calendar.YEAR)-1970;
int m = c.get(Calendar.MONTH);
int d = c.get(Calendar.DAY_OF_MONTH)-1;

Java number of days between dates

LocalDate start = LocalDate.parse("2020-11-03");
LocalDate end = LocalDate.parse("2020-12-15");

long diff = DAYS.between(start, end);

Source: javaf1.com

How to calculate the amount of months between two dates java

LocalDate jamesBirthDay = new LocalDate(1955, 5, 19);
LocalDate now = new LocalDate(2015, 7, 30);
        
int monthsBetween = Months.monthsBetween(jamesBirthDay, now).getMonths();
int yearsBetween = Years.yearsBetween(jamesBirthDay, now).getYears();
        
System.out.println("Month since father of Java born : " 
                    + monthsBetween);
System.out.println("Number of years since father of Java born : " 
                    + yearsBetween);

Source: javarevisited.blogspot.com

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