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Subtract 4 hours from the time and print out the date and time

import java.text.DateFormat; import java.util.Calendar; public class CalendarManipulation {   public static void main(String s[]) {     Calendar cal = Calendar.getInstance();     DateFormat df = DateFormat.getDateTimeInstance(DateFormat.FULL,         DateFormat.MEDIUM);     System.out.println(df.format(cal.getTime()));     cal.add(Calendar.HOUR, -4);     System.out.println(df.format(cal.getTime()));   } }