Java Utililty Methods Date to Month

Calendar one = Calendar.getInstance();
one.setTime(_one);
Calendar two = Calendar.getInstance();
two.setTime(_two);
int yearInt = two.get(Calendar.YEAR) - one.get(Calendar.YEAR);
int monthInt = two.get(Calendar.MONTH) - one.get(Calendar.MONTH);
int dayInt = two.get(Calendar.DAY_OF_MONTH) - one.get(Calendar.DAY_OF_MONTH);
return yearInt * 12 + monthInt + (dayInt > 0 ? 1 : 0);
...

cal.setTime(date);
cal.add(Calendar.MONTH, 1);
cal.add(Calendar.DAY_OF_MONTH, -1);
Date tmpdate1 = new Date(cal.getTime().getTime());
return tmpdate1;

Calendar calendar = Calendar.getInstance();
if (null != date) {
    calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DATE));
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
...

Calendar c = Calendar.getInstance();
c.setTime(d);
int month = c.get(Calendar.MONTH) + 1;
return c.get(Calendar.YEAR) + "_" + (month < 10 ? "0" : "") + month;

Calendar temp = Calendar.getInstance();
temp.setTime(date);
int y = temp.get(Calendar.YEAR);
int m = temp.get(Calendar.MONTH) + 1;
int d = temp.get(Calendar.DAY_OF_MONTH);
int rm = 0, ry = 0;
if (d >= 1 && d <= 20) {
    rm = m;
...

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.MONTH) + 1;

int sourceMonth = getMonth(sourceDate);
int sourceYear = getYear(sourceDate);
int targetMonth = getMonth(targetDate);
int targetYear = getYear(targetDate);
return (sourceYear - targetYear) * 12 + sourceMonth - targetMonth;

Calendar cal = Calendar.getInstance();
if (currentdate != null) {
    cal.setTime(currentdate);
} else {
    cal.setTime(new Date());
return cal.get(Calendar.MONTH) + 1;

return getField(date, Calendar.MONTH);

Calendar cal = new GregorianCalendar();
cal.setTime(dt);
return (cal.get(Calendar.MONTH));