How to add hours, minutes, seconds into DateTime in Joda-Time?

By Wayan in Joda-Time 2 Comments

In this example you will learn how to add hours, minutes or seconds to a DateTime object in Joda-Time. Some methods are available to add or subtract hours, minutes or seconds from the object, as you can see in the example below.

The DateTime object is an immutable object, which means calling one of the plus() or minus() method does not modify the current object. Instead, these methods return a new DateTime object for each method calls.

In the code snippet below we call the plus() and minus() method without storing the result of the operation, we are only going to print it out. The get the new value of the DateTime object you need to assign it to a variable.

package org.kodejava.joda;

import org.joda.time.DateTime;

public class TimeCalculationDemo {
    public static void main(String[] args) {
        // Creates an instance of current DateTime which represents the
        // current date time.
        DateTime dateTime = new DateTime();
        System.out.println("DateTime            = " + dateTime);

        // Plus some hours, minutes, and seconds to the original DateTime.
        System.out.println("Plus 60 seconds is  = " + dateTime.plusSeconds(60));
        System.out.println("Plus 10 minutes is  = " + dateTime.plusMinutes(10));
        System.out.println("Plus 1 hour is      = " + dateTime.plusHours(1));

        // Minus some hours, minutes, and seconds to the original DateTime.
        System.out.println("Minus 60 seconds is = " + dateTime.minusSeconds(60));
        System.out.println("Minus 10 minutes is = " + dateTime.minusMinutes(10));
        System.out.println("Minus 1 hour is     = " + dateTime.minusHours(1));
    }
}

The program print the following result. The output shows the result of adding or subtracting seconds, minutes and hours the the DateTime object.

DateTime            = 2021-10-31T22:56:55.715+08:00
Plus 60 seconds is  = 2021-10-31T22:57:55.715+08:00
Plus 10 minutes is  = 2021-10-31T23:06:55.715+08:00
Plus 1 hour is      = 2021-10-31T23:56:55.715+08:00
Minus 60 seconds is = 2021-10-31T22:55:55.715+08:00
Minus 10 minutes is = 2021-10-31T22:46:55.715+08:00
Minus 1 hour is     = 2021-10-31T21:56:55.715+08:00

Maven Dependencies

<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.12.7</version>
</dependency>

Maven Central

Wayan
Latest posts by Wayan (see all)

2 Comments

  1. It not working as expected. Here is my code and result.

    package com.demo;

import org.joda.time.DateTime;

public class App {
    public static void main(String[] args) {
        DateTime dateTime=new DateTime();
        System.out.println("Date Time :"+dateTime);
        dateTime.plusHours(1);
        System.out.println("Date Time :"+dateTime);
        dateTime.plusMinutes(4);
        System.out.println("Date Time :"+dateTime);
    }
}

    Result:
    Date Time :2016-08-29T03:31:39.047+07:00
    Date Time :2016-08-29T03:31:39.047+07:00
    Date Time :2016-08-29T03:31:39.047+07:00

    Reply

    • Hello Hien Khuu,

      Joda-Tme objects are immutable. When you change the property of a DateTime object it will not change the current object, instead it will return a new copy. You need to assign the modification result into a new object to get the modified value.

      For example:

      DateTime plusOneHour = dateTime.plusHours(1);
DateTime plusFourMinute = plusOneHour.plusMinutes(4);

      Or you could combine the operation:

      DateTime plusOneHourFourMinute = dateTime.plusHours(1).plusMinutes(4);
      Reply

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