Java Utililty Methods Week Day

String conStr = null;
int dayOfWeek = 0;
if (week == 0) {
    conStr = str;
    dayOfWeek = getCalendar(conStr).get(Calendar.DAY_OF_WEEK);
} else {
    conStr = addDays(str, week * 7);
    dayOfWeek = getCalendar(conStr).get(Calendar.DAY_OF_WEEK);
...

try {
    return getDefaultDateFormat().format(getDefaultWeekFormat().parse(week));
} catch (ParseException e) {
    return "ERROR_DAY";

try {
    return getDefaultDateFormat().format(getDefaultWeekFormat().parse(week));
} catch (ParseException e) {
    return "ERROR_DAY";

Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());

Calendar c = new GregorianCalendar();
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); 
c.set(Calendar.MILLISECOND, 999);
c.set(Calendar.SECOND, 59);
c.set(Calendar.MINUTE, 59);
c.set(Calendar.HOUR_OF_DAY, 23);
return c.getTime();

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DATE, 0);
return calendar.get(Calendar.WEEK_OF_MONTH);

Calendar c = Calendar.getInstance();
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
if (dayOfWeek == 0) {
    dayOfWeek = 7;
c.add(Calendar.DATE, -dayOfWeek);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.format(c.getTime());
...

return getLastWeekday(getYesterday());

return getLastWeekDay(weekDay, new Date());

return getLastWeekDay(weekDay, new Date());