[java] Getting last day of the month in a given string date

This looks like your needs:

http://obscuredclarity.blogspot.de/2010/08/get-last-day-of-month-date-object-in.html

code:

import java.text.DateFormat;  
import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Calendar;  
import java.util.Date;  

//Java 1.4+ Compatible  
//  
// The following example code demonstrates how to get  
// a Date object representing the last day of the month  
// relative to a given Date object.  

public class GetLastDayOfMonth {  

    public static void main(String[] args) {  

        Date today = new Date();  

        Calendar calendar = Calendar.getInstance();  
        calendar.setTime(today);  

        calendar.add(Calendar.MONTH, 1);  
        calendar.set(Calendar.DAY_OF_MONTH, 1);  
        calendar.add(Calendar.DATE, -1);  

        Date lastDayOfMonth = calendar.getTime();  

        DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
        System.out.println("Today            : " + sdf.format(today));  
        System.out.println("Last Day of Month: " + sdf.format(lastDayOfMonth));  
    }  

} 

Output:

Today            : 2010-08-03  
Last Day of Month: 2010-08-31  

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