Question

I am working on a project where the requirement is to have a date calculated as being the last Friday of a given month. I think I have a solution that only uses standard Java, but I was wondering if anyone knew of anything more concise or efficient. Below is what I tested with for this year:

    for (int month = 0; month < 13; month++) {         GregorianCalendar d = new GregorianCalendar();         d.set(d.MONTH, month);         System.out.println('Last Week of Month in ' + d.getDisplayName(d.MONTH, Calendar.LONG, Locale.ENGLISH) + ': ' + d.getLeastMaximum(d.WEEK_OF_MONTH));         d.set(d.DAY_OF_WEEK, d.FRIDAY);         d.set(d.WEEK_OF_MONTH, d.getActualMaximum(d.WEEK_OF_MONTH));         while (d.get(d.MONTH) > month || d.get(d.MONTH) < month) {             d.add(d.WEEK_OF_MONTH, -1);         }         Date dt = d.getTime();         System.out.println('Last Friday of Last Week in  ' + d.getDisplayName(d.MONTH, Calendar.LONG, Locale.ENGLISH) + ': ' + dt.toString());     } 

Answer 1

Based on marked23’s suggestion:

public Date getLastFriday( int month, int year ) {    Calendar cal = Calendar.getInstance();    cal.set( year, month + 1, 1 );    cal.add( Calendar.DAY_OF_MONTH, -( cal.get( Calendar.DAY_OF_WEEK ) % 7 + 1 ) );    return cal.getTime(); }