Week Start and End Dates in Java

StartEndWeek.java

import java.util.Calendar;
import java.util.Date;

public class StartEndWeek {
	private Calendar cal;
	private int weekStart;

	public StartEndWeek(Date date, int weekStart) {
		this.weekStart = weekStart;
		this.cal = Calendar.getInstance();
		this.cal.setTime(date);
	}

	private static void startOfDay(Calendar calendar) {
		calendar.set(Calendar.HOUR, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.AM_PM, 0);
	}

	private static void endOfDay(Calendar calendar) {
		calendar.set(Calendar.HOUR, 11);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.AM_PM, 1);
	}

	private int getWeekDay(Calendar calendar) {
		return calendar.get(Calendar.DAY_OF_WEEK);
	}

	private Date getWeekBoundary(boolean isStart) {
		cal.add(Calendar.DATE, -getWeekDay(cal) + weekStart + (isStart ? 0 : 6));
		if (isStart) startOfDay(cal); else endOfDay(cal);
		return cal.getTime();
	}

	public Date getWeekEnd() {
		return getWeekBoundary(false);
	}

	public Date getWeekStart() {
		return getWeekBoundary(true);
	}
}

Inspired from this blog by Guy Bashan

Inspired by http://www.codereye.com/2008/10/get-start-and-end-of-week.html#comment-form