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.
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
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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