Ejemplo de código de diferencia de fecha de Java en días

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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 =newSimpleDateFormat("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 días entre dos fechas en java

import java.util.Date;
import java.text.SimpleDateFormat;classExamplepublicstaticvoidmain(String args[])
	 SimpleDateFormat myFormat =newSimpleDateFormat("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 4: java 8 dateiff en días

LocalDate dateBefore;
LocalDate dateAfter;
long daysBetween =DAYS.between(dateBefore, dateAfter);

Ejemplo 5: java localdate restar dos fechas

@Test
publicvoidgivenTwoDatesInJava8_whenDifferentiating_thenWeGetSix()
    LocalDate now = LocalDate.now();
    LocalDate sixDaysBehind = now.minusDays(6);
 
    Period period = Period.between(now, sixDaysBehind);int diff = period.getDays();assertEquals(diff,6);

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