1. Calendar.add
Example to add 1 year, 1 month, 1 day, 1 hour, 1 minute and 1 second to the current date.
DateExample.java
package com.mkyong.time;
import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class DateExample { private static final DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); public static void main(String[] args) { Date currentDate = new Date(); System.out.println(dateFormat.format(currentDate)); // convert date to calendar Calendar c = Calendar.getInstance(); c.setTime(currentDate); // manipulate date c.add(Calendar.YEAR, 1); c.add(Calendar.MONTH, 1); c.add(Calendar.DATE, 1); //same with c.add(Calendar.DAY_OF_MONTH, 1); c.add(Calendar.HOUR, 1); c.add(Calendar.MINUTE, 1); c.add(Calendar.SECOND, 1); // convert calendar to date Date currentDatePlusOne = c.getTime(); System.out.println(dateFormat.format(currentDatePlusOne)); } } Output
2016/11/10 17:11:48 2017/12/11 18:12:49
2. Java 8 Plus Minus
In Java 8, you can use the plus and minus methods to manipulate LocalDate, LocalDateTime and ZoneDateTime, see the following examples
LocalDateTimeExample.java
package com.mkyong.time;
import java.text.DateFormat; import java.text.SimpleDateFormat; import java.time.LocalDateTime; import java.time.ZoneId; import java.time.format.DateTimeFormatter; import java.util.Date; public class LocalDateTimeExample { private static final String DATE_FORMAT = "yyyy/MM/dd HH:mm:ss"; private static final DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT); private static final DateTimeFormatter dateFormat8 = DateTimeFormatter.ofPattern(DATE_FORMAT); public static void main(String[] args) { // Get current date Date currentDate = new Date(); System.out.println("date : " + dateFormat.format(currentDate)); // convert date to localdatetime LocalDateTime localDateTime = currentDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime(); System.out.println("localDateTime : " + dateFormat8.format(localDateTime)); // plus one localDateTime = localDateTime.plusYears(1).plusMonths(1).plusDays(1); localDateTime = localDateTime.plusHours(1).plusMinutes(2).minusMinutes(1).plusSeconds(1); // convert LocalDateTime to date Date currentDatePlusOneDay = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant()); System.out.println("\nOutput : " + dateFormat.format(currentDatePlusOneDay)); } } Output
date : 2016/11/10 17:40:11 localDateTime : 2016/11/10 17:40:11 Output : 2017/12/11 18:41:12
http://www.mkyong.com/java/java-how-to-add-days-to-current-date/