LocalDateTime fromDateTime = LocalDateTime.of(1984, 12, 16, 7, 45, 55);
LocalDateTime toDateTime = LocalDateTime.of(2014, 9, 10, 6, 40, 45);
LocalDateTime tempDateTime = LocalDateTime.from( fromDateTime );
long years = tempDateTime.until( toDateTime, ChronoUnit.YEARS );
tempDateTime = tempDateTime.plusYears( years );
long months = tempDateTime.until( toDateTime, ChronoUnit.MONTHS );
tempDateTime = tempDateTime.plusMonths( months );
long days = tempDateTime.until( toDateTime, ChronoUnit.DAYS );
tempDateTime = tempDateTime.plusDays( days );
long hours = tempDateTime.until( toDateTime, ChronoUnit.HOURS );
tempDateTime = tempDateTime.plusHours( hours );
long minutes = tempDateTime.until( toDateTime, ChronoUnit.MINUTES );
tempDateTime = tempDateTime.plusMinutes( minutes );
long seconds = tempDateTime.until( toDateTime, ChronoUnit.SECONDS );
System.out.println( years + " years " +
months + " months " +
days + " days " +
hours + " hours " +
minutes + " minutes " +
seconds + " seconds.");
//prints: 29 years 8 months 24 days 22 hours 54 minutes 50 seconds.