какая сейчас неделя от начала года?

    public boolean isEven() {
        Date today = new Date();
        SimpleDateFormat sToday = new SimpleDateFormat("yyyyMMdd");
        String dToday = sToday.format(today); 
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
        Date date = null;
        try {
            date = df.parse(dToday); 
        } catch (ParseException e) { e.printStackTrace(); }
        
        Calendar cal = Calendar.getInstance();
        cal.setMinimalDaysInFirstWeek(7);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        cal.setTime(date);
        int week = cal.get(Calendar.WEEK_OF_YEAR);
        Log.d("week", String.valueOf(week)); 
        if (week % 2 == 0) return true;
        else return false;
    }

Calendar cal = Calendar.getInstance();
int week = cal.get(Calendar.WEEK_OF_YEAR);
int day = cal.get(Calendar.DAY_OF_YEAR);