Ejemplo 1: encontrar la diferencia en días entre dos fechas java
String dateStart = "01/14/2015 08:29:58";
String dateStop = "01/15/2015 11:31:48";
//HH converts hour in 24 hours format (0-23), day calculation
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date d1 = null;
Date d2 = null;
d1 = format.parse(dateStart);
d2 = format.parse(dateStop);
//in milliseconds
long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1000) % 24;
long diffDays = diff / (24 * 60 * 60 * 1000);
System.out.print(diffDays + " days, ");
System.out.print(diffHours + " hours, ");
System.out.print(diffMinutes + " minutes, ");
System.out.print(diffSeconds + " seconds.");
Ejemplo 2: java número de días entre fechas
LocalDate start = LocalDate.parse("2020-11-03");
LocalDate end = LocalDate.parse("2020-12-15");
long diff = DAYS.between(start, end);
Ejemplo 3: calcular el número de años, meses y días entre dos fechas en 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;
Ejemplo 4: calcular días entre dos fechas en java
import java.util.Date;
import java.text.SimpleDateFormat;
class Example{
public static void main(String args[]){
SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");
String dateBeforeString = "31 01 2014";
String dateAfterString = "02 02 2014";
try {
Date dateBefore = myFormat.parse(dateBeforeString);
Date dateAfter = myFormat.parse(dateAfterString);
long difference = dateAfter.getTime() - dateBefore.getTime();
float daysBetween = (difference / (1000*60*60*24));
/* You can also convert the milliseconds to days using this method
* float daysBetween =
* TimeUnit.DAYS.convert(difference, TimeUnit.MILLISECONDS)
*/
System.out.println("Number of Days between dates: "+daysBetween);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Ejemplo 5: java obtiene el número de meses entre dos fechas
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;
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