Java Utililty Methods Week Day

int day = getNumberFromDate(date, Calendar.DAY_OF_WEEK);
if (day == 1) {
    return 7;
return day - 1;

Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
    w = 0;
return WEEKDAYS_EN[w];

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat df2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar calendar = Calendar.getInstance();
int w = calendar.get(Calendar.DAY_OF_WEEK);
calendar.set(Calendar.DAY_OF_MONTH, calendar.get(Calendar.DAY_OF_MONTH) - w);
String day_last = df.format(calendar.getTime());
StringBuffer str = new StringBuffer().append(day_last).append(" 23:59:59");
day_last = str.toString();
...

Calendar c = Calendar.getInstance();
c.setTimeInMillis(date.getTime() - 604800000L);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
Date lastWeekDate = c.getTime();
c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
...

return firstDayOfWeek;

if (_firstDayofWeek != -1) {
    return _firstDayofWeek;
Calendar cal = Calendar.getInstance();
_firstDayofWeek = cal.getFirstDayOfWeek();
return _firstDayofWeek;

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return getADayOfWeek(calendar, Calendar.MONDAY).getTime();

Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.SUNDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); 
return c.getTime();

if (dayOfWeek(date) == 1) {
    return addDays(date, -6);
return addDays(date, -1 * (dayOfWeek(date) - 2));

return getDayOfWeek(format, Calendar.MONDAY);