This is an example of how to add and subtract Days from a Date using the Calendar, that provides methods to convert between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR. Adding and subtracting Days from a Date using the Calendar implies that you should:
- Create a new Calendar object, using
getInstance()API method of Calendar, that gets a calendar using the default time zone and locale. - Use
add(int field, int amount)API method of Calendar to add an int amount of time to the given calendar field, that isCalendar.DATE. - Use
add(int field, int amount)API method of Calendar again, this time to subtract an int amount of time to the given calendar field, that isCalendar.DATE. - We can get the time that this calendar object represents every time that it is changed , using
get(int field)API method, withCalendar.MONTH,Calendar.DATEandCalendar.YEARas fields. Every time after the calendar is changed, the value for theDATEfield will be different.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.Calendar;
public class AddSubtractDateDays {
public static void main(String[] args) {
int daysToAdd = 4;
int daysToSubtract = 10;
Calendar c = Calendar.getInstance();
System.out.println("Current date : " + (c.get(Calendar.MONTH) + 1) +
"-" + c.get(Calendar.DATE) + "-" + c.get(Calendar.YEAR));
// add days to current date
c.add(Calendar.DATE, daysToAdd);
System.out.println("Date (after): " + (c.get(Calendar.MONTH) + 1) +
"-" + c.get(Calendar.DATE) + "-" + c.get(Calendar.YEAR));
c = Calendar.getInstance();
c.add(Calendar.DATE, -daysToSubtract);
System.out.println("Date (before): " + (c.get(Calendar.MONTH) + 1) +
"-" + c.get(Calendar.DATE) + "-" + c.get(Calendar.YEAR));
}
}Output:
Current date : 10-19-2011 Date (after): 10-23-2011 Date (before): 10-9-2011
This was an example of how to add and subtract Days from a Date using the Calendar in Java.
