JAVA

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);

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);

java get number of months between two dates

		LocalDate currentDay = LocalDate.of(1955, Month.MAY, 19);
		LocalDate desiredDay = LocalDate.now();
		Period age = Period.between(currentDay, desiredDay);
		int years = age.getYears();
		int months = age.getMonths();

		int numberOfMonthsBetweenDates =  months+years*12;

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;

find number of weeks between two dates in java

SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");
String classStartData = "31 01 2021";
String classEndData = "08 03 2021";

Date dateClassStart = myFormat.parse(classStartData);
Date dateClassEnd = myFormat.parse(classEndData);

long differenceWeek = dateClassEnd.getTime() - dateClassStart.getTime();
int programLength = (int)(TimeUnit.DAYS.convert(differenceWeek, TimeUnit.MILLISECONDS)/7);
System.out.println("Class length in weeks: " +programLength);