Java Utililty Methods Month Day

Calendar calendar = Calendar.getInstance();
Date d = new Date();
calendar.setTime(d);
calendar.set(Calendar.DATE, 1);
return calendar.getTime();

Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.DAY_OF_MONTH);

final GregorianCalendar c = gregorianCalendarThreadLocal.get();
c.setTime(date);
c.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.getActualMaximum(Calendar.DAY_OF_MONTH));
return c.get(Calendar.DAY_OF_MONTH);

calendar.setTime(date);
return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getActualMaximum(5);

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
ParsePosition pos1 = new ParsePosition(0);
base_month = base_month + "01";
java.util.Date FirstDate = sdf.parse(base_month, pos1);
return String.valueOf(sdf.format(FirstDate));

String curYearMonth = getCurYearMonth();
return curYearMonth + "-01";

Calendar c = new GregorianCalendar();
c.setTime(theDate);
c.set(Calendar.DAY_OF_MONTH, 1);
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
return c.getTime();
...

SimpleDateFormat df = new SimpleDateFormat(webFormat);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH, months);
Date theDate = calendar.getTime();
GregorianCalendar gcLast = (GregorianCalendar) Calendar.getInstance();
gcLast.setTime(theDate);
gcLast.set(Calendar.DAY_OF_MONTH, 1);
...

Calendar calendar = new GregorianCalendar();
calendar.set(Calendar.DATE, 1);
SimpleDateFormat simpleFormate = new SimpleDateFormat("yyyy-MM-dd");
return simpleFormate.format(calendar.getTime()).trim();