Adding n hours to a date in Java?

Question

How do I add n hours to a Date object? I found another example using days on StackOverflow, but still don't understand how to do it with hours.

Answer 1

You can do it with Joda DateTime API

DateTime date= new DateTime(dateObj);
date = date.plusHours(1);
dateObj = date.toDate();

Answer 2

by using Java 8 classes. we can manipulate date and time very easily as below.

LocalDateTime today = LocalDateTime.now();
LocalDateTime minusHours = today.minusHours(24);
LocalDateTime minusMinutes = minusHours.minusMinutes(30);
LocalDate localDate = LocalDate.from(minusMinutes);

Answer 3

Since Java 8:

LocalDateTime.now().minusHours(1);

See LocalDateTime API.

Answer 4

You can use this method, It is easy to understand and implement :

public static java.util.Date AddingHHMMSSToDate(java.util.Date date, int nombreHeure, int nombreMinute, int nombreSeconde) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.HOUR_OF_DAY, nombreHeure);
    calendar.add(Calendar.MINUTE, nombreMinute);
    calendar.add(Calendar.SECOND, nombreSeconde);
    return calendar.getTime();
}

Answer 5

With Joda-Time

DateTime dt = new DateTime();
DateTime added = dt.plusHours(6);

Answer 6

Check Calendar class. It has add method (and some others) to allow time manipulation. Something like this should work.

    Calendar cal = Calendar.getInstance(); // creates calendar
    cal.setTime(new Date()); // sets calendar time/date
    cal.add(Calendar.HOUR_OF_DAY, 1); // adds one hour
    cal.getTime(); // returns new date object, one hour in the future

Check API for more.