Java Utililty Methods Day in Month

Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
cal.add(Calendar.MONTH, 1);
cal.set(Calendar.DAY_OF_MONTH, 1);
SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
return formatter.format(cal.getTime());

if (month > 12)
    return 0;
int[] monDays = new int[] { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if (((year) % 4 == 0 && (year) % 100 != 0) || (year) % 400 == 0)
    monDays[2]++;
return monDays[month];

java.util.Calendar cal = java.util.Calendar.getInstance();
java.text.SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");
cal.add(Calendar.MONTH, month);
sDateFormat.format(cal.getTime());
System.out.println(sDateFormat.format(cal.getTime()));
return sDateFormat.format(cal.getTime());

SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
Date mydate = formatter.parse(curday);
Calendar calendar = Calendar.getInstance();
calendar.setTime(mydate);
calendar.add(Calendar.MONTH, month);
return formatter.format(calendar.getTime());

return dayofmonth;

return Integer.parseInt(new SimpleDateFormat("dd").format(d));

int year = getYearOfDate(date);
int month = getMonthOfDate(date) - 1;
int day = getDayOfDate(date);
int hour = getHourOfDate(date);
int minute = getMinuteOfDate(date);
int second = getSecondOfDate(date);
Calendar l_calendar = new GregorianCalendar(year, month, day, hour, minute, second);
return l_calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
...

int year = getYearOfDate(p_date);
int month = getMonthOfDate(p_date) - 1;
int day = getDayOfDate(p_date);
int hour = getHourOfDate(p_date);
int minute = getMinuteOfDate(p_date);
int second = getSecondOfDate(p_date);
Calendar l_calendar = new GregorianCalendar(year, month, day, hour, minute, second);
return l_calendar.getActualMaximum(l_calendar.DAY_OF_MONTH);
...

int d = dayOfYear;
if (d < DAYS_JANUARY) {
    return d + 1;
if (d < DAYS_FEBRUARY) {
    return d - (DAYS_JANUARY - 1);
if (leap) {
...

int days = 0;
if (month == 2) {
    if (year % 4 != 0) {
        days = 28;
    } else {
        if (year % 100 == 0 && year % 400 != 0) {
            days = 28;
        } else {
...