Java Utililty Methods Day of Week

if (d == null) {
    return -1;
Calendar cal = Calendar.getInstance();
cal.setTime(d);
int w = cal.get(Calendar.DAY_OF_WEEK);
return w;

if (d == null)
    return -1;
final Calendar c = new GregorianCalendar();
c.setTime(d);
return c.get(Calendar.DAY_OF_WEEK) - 1;

GregorianCalendar cal = getCalender(date, false);
return cal.get(Calendar.DAY_OF_WEEK);

Calendar cal = Calendar.getInstance();
cal.setTime(date);
int idx = cal.get(Calendar.DAY_OF_WEEK) - 1;
return WEEK_DAYS[idx];

GregorianCalendar cal = new GregorianCalendar();
cal.setTime(date);
return cal.get(Calendar.DAY_OF_WEEK);

Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_WEEK);

Calendar cal = new GregorianCalendar();
cal.setTime(dt);
if (weekDay == 7)
    weekDay = 1;
else
    weekDay++;
cal.set(GregorianCalendar.DAY_OF_WEEK, weekDay);
return cal.getTime();
...

Calendar cal = parseDateTime(strDate);
return cal.get(Calendar.DAY_OF_WEEK);

final Calendar calendar = Calendar.getInstance();
calendar.setTime(actualDate);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
final Date newDate = calendar.getTime();
if (newDate.before(actualDate)) {
    calendar.add(Calendar.WEEK_OF_YEAR, Calendar.SATURDAY);
return calendar.getTime();
...

List<String> holidays = Arrays.asList(Holidays);
Calendar now = Calendar.getInstance();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int d = (int) ((now.getTimeInMillis() - calendar.getTimeInMillis()) / (24 * 60 * 60 * 1000));
int n = 0;
for (int i = 0; i < d; i++) {
    calendar.add(Calendar.DATE, 1);
...