Question

How to substract hours form current time using Calendar in Java

Answer 1

package javaapplication1;

import java.util.Calendar;

public class JavaApplication1 {

    public static void main(String[] args) {

        Calendar now = Calendar.getInstance();

        System.out.println("Today: " + (now.get(Calendar.MONTH) + 1)  + "-"
                           + now.get(Calendar.DATE)
                           + "-"
                           + now.get(Calendar.YEAR));

        System.out.println("Current time: " + now.get(Calendar.HOUR_OF_DAY) + ":"
                           + now.get(Calendar.MINUTE)
                           + ":"
                           + now.get(Calendar.SECOND));
                     
        // substract 3 hours from current time
        now.add(Calendar.HOUR, -3);
        
        System.out.println("Current time - 3 hours: " + now.get(Calendar.HOUR_OF_DAY) + ":"
                           + now.get(Calendar.MINUTE)
                           + ":"
                           + now.get(Calendar.SECOND));
    }
}

/*

run:

Today: 10-16-2016
Current time: 17:55:43
Current time - 3 hours: 14:55:43

*/

 

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