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/* Add or substract hours to current time using Java Calendar This example shows how to add or substract hours in current time using Java Calendar class. */ import java.util.Calendar; public class AddHoursToCurrentDate { public static void main(String[] args) { //create Calendar instance 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)); //add hours to current date using Calendar.add method now.add(Calendar.HOUR,10); System.out.println("New time after adding 10 hours : " + now.get(Calendar.HOUR_OF_DAY) + ":" + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND)); /* * Java Calendar class automatically adjust the date accordingly if adding * hours to the current time causes current date to be changed. */ System.out.println("New date after adding 10 hours : " + (now.get(Calendar.MONTH) + 1) + "-" + now.get(Calendar.DATE) + "-" + now.get(Calendar.YEAR)); //substract hours from current date using Calendar.add method 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)); } } /* Typical output would be Current Date : 12-25-2007 Current time : 18:31:42 New time after adding 10 hours : 4:31:42 New date after adding 10 hours : 12-26-2007 Time before 3 hours : 15:31:42 */ |
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