How to subtract X days from a date using Java calendar and with java 8

• To subtract "X" days from a date in java of calendar class object.
• calendar.add(Calendar.DAY_OF_MONTH, -X);
• add method of calendar has a option to subtract days from given date.
• Lets see and example program on how to subtract days from a date in java 

 Program #1: Java Example program to subtract 2 days from current date using calendar class.

1. package com.javadate;
2.  
3. import java.util.Calendar;
4. /**
5. * how to subtract date in java
6. * @author www.instanceofjava.com
7. */
8. public class SubtractDateJava {
9.  
10.     public static void main(String[] args) {
11.         
12.         Calendar calendar = Calendar.getInstance(); // this would default to now
13.         
14.         System.out.println(calendar.getTime());
15.         //subtract  two days from todays date.
16.         calendar.add(Calendar.DAY_OF_MONTH, -2);
17.         
18.         System.out.println(calendar.getTime());
19.         
20.     }
21.  
22. }

Output:

1. Sun May 07 22:17:22 IST 2017
2. Fri May 05 22:17:22 IST 2017

Java 8 subtract dates

• We can subtract days from given date in java without using calendar class also.
• Now in Java 8 we have LocalDateTime class. and it provides a method to subtract days from given date.
• LocalDateTime.now().minusDays(30);

Program #2: Java Example program to subtract 2 days from current date without using calendar class. (Use Java 8)

1. package com.javadate;
2.  
3. import java.time.LocalDateTime;
4. import java.time.ZoneOffset;
5. import java.util.Date;
6. /**
7. * how to subtract date in java using example program
8. * @author www.instanceofjava.com
9. */
10. public class SubtractDateJava {
11.  
12.     public static void main(String[] args) {
13.         
14.         
15.         System.out.println(LocalDateTime.now());
16.         LocalDateTime dateBefore20Days = LocalDateTime.now().minusDays(20);
17.         
18.         System.out.println(dateBefore20Days);
19.         
20.         Date date = Date.from(dateBefore20Days.toInstant(ZoneOffset.UTC));
21.         System.out.println(date);
22.     }
23.  
24. }

Output:

1. 2017-05-07T22:30:22.308
2. 2017-04-17T22:30:22.308
3. Tue Apr 18 04:00:22 IST 2017

Program #3: Java Example program to subtract 2 days from current date without using calendar class. (Use Java 8) Using Eclipse IDE.