Java: calculate last Saturday

Java method that returns the date of last Saturday with time set to (00:00:00):

public class DateHelper

{

  public static Date getLastSatuerday(Date date)

    {

Calendar calendar = Calendar.getInstance();

int weekday = calendar.get(Calendar.DAY_OF_WEEK);

Date lastSat = DateHelper.incrementDays(date, (-weekday));

Calendar cal = new GregorianCalendar();

cal.setTime(lastSat);

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

cal.set(Calendar.MILLISECOND, 0);

return cal.getTime();

    }

//increment hours of day

    public static Date incrementHours(Date date, int hours)

    {

GregorianCalendar calendar = new GregorianCalendar();

calendar.setTime(date);

calendar.add(Calendar.HOUR_OF_DAY, hours);

return calendar.getTime();

    }

}

JUnit test for above method: 

  public void test_getLastSatuerday()

    {

Date date = DateHelper.buildToday();

date = DateHelper.incrementHours(date, 2);

Date weekday = DateHelper.getLastSatuerday(date);

log.warn("Today is: " + date + " , last sat is: " + weekday);

    }

Output:
WARN 2009-12-17 09:05:42.306 com.xxx.xxx.server.common.DateHelperTest.test_getLastSatuerday()
Today is: Thu Dec 17 02:00:00 CST 2009 , last sat is: Sat Dec 12 00:00:00 CST 2009