获取当前日期：

public class TestDate { 
  public static void main(String[] args) { 
     Date now = new Date(); 
     Calendar cal = Calendar.getInstance();

}

获取当月最后一天：

public static boolean isMonthEnd(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.DATE) == calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
}

获取当前日期时间，获取当月最后一天