cómo restar dos fechas en el ejemplo de código java

Ejemplo 1: diferencia de fecha en minutos java

long diff = d2.getTime() - d1.getTime();//as given

long seconds = TimeUnit.MILLISECONDS.toSeconds(diff);
long minutes = TimeUnit.MILLISECONDS.toMinutes(diff);

Ejemplo 2: java localdate restar dos fechas

@Test
public void givenTwoDatesInJava8_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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