Development Class Java

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  4. Subtract hours from current date using Calendar add method
import java.util.Calendar;
public class Main {
  public static void main(String[] args) {
    Calendar now = Calendar.getInstance();
    System.out.println("Current Date : " + (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));
    now = Calendar.getInstance();
    now.add(Calendar.HOUR, -3);
    System.out.println("Time before 3 hours : " + now.get(Calendar.HOUR_OF_DAY) + ":"
        + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND));
  }
}