Months and years

[Paul Keohan]

Is there a way in Java to get future month informtaion? Such as, what day of the week is August 15th 2003 going to be. I'm looking at the Calendar class to see if that might provide a way.

[Nathan Pruett]

Look into SimpleDateFormat in the API to get the 'patterns' you can use to format a date...

I believe the code below is a quick and dirty ( no error checking ) solution... just run the program, passing in a command-line argument in the form of mm/dd/yyyy, where mm is the month, dd is the day, and yyyy is the year. The program will return the day of the week that date is...

import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
 
public class WeekDay
{
    public static void main( String[] args )
    {
        String date = args[ 0 ];
        int month = Integer.parseInt( date.substring( 0, 2 ) );
        int day = Integer.parseInt( date.substring( 3, 5 ) );
        int year = Integer.parseInt( date.substring( 6, 10 ) );
 
        SimpleDateFormat dayOfWeek = 
            new SimpleDateFormat( "MMMM dd, yyyy ' is a ' EEEE" );
        GregorianCalendar g =
            new GregorianCalendar( year, month - 1, day );
        String output = dayOfWeek.format( g.getTime() );
        System.out.println( output );
    }
}

HTH,
-Nate
[This message has been edited by Nathan Pruett (edited July 10, 2001).]