How to calculate time difference in java?

Question

I want to subtract two timeperiods say 16:00:00 from 19:00:00. Is there any java function for this? The results can be in milliseconds, seconds, or minutes.

Answer 1

Try this:

public String timeDifference8(String startTime, String endTime) {
    LocalTime initialTime = LocalTime.parse(startTime);
    LocalTime finalTime =LocalTime.parse(endTime);
    StringJoiner joiner = new StringJoiner(":");
    long hours = initialTime.until( finalTime, ChronoUnit.HOURS);
    initialTime = initialTime.plusHours( hours );
    long minutes = initialTime.until(finalTime, ChronoUnit.MINUTES);
    initialTime = initialTime.plusMinutes( minutes );
    long seconds = initialTime.until( finalTime, ChronoUnit.SECONDS);
    joiner.add(String.valueOf(hours));
    joiner.add(String.valueOf(minutes));
    joiner.add(String.valueOf(seconds));
    return joiner.toString();
}